A Yao woman, Tiantouzhai, Longji Terraces, China, November 2010
|Regions with significant populations|
| China: 2,637,421 @2000
Vietnam: 891,151 @2019 
|Mienic languages, Bunu, Pa-Hng, Lakkja, Mandarin Chinese, Shaozhou Tuhua, Vietnamese, English|
|Predominantly Yao folk religion, minority Buddhism|
The Yao people (its majority branch is also known as Mien; simplified Chinese: 瑶族; traditional Chinese: 瑤族; pinyin: Yáo zú; Vietnamese: người Dao) is a government classification for various minorities in China and Vietnam. They are one of the 55 officially recognised ethnic minorities in China and reside in the mountainous terrain of the southwest and south. They also form one of the 54 ethnic groups officially recognised by Vietnam. In China in the last census in 2000, they numbered 2,637,421 and in Vietnam census in 2019 they numbered 891,151. 
The origins of the Yao can be traced back 2000 years starting in Hunan. The Yao and Hmong were among the rebels during the Miao Rebellions against the Ming dynasty. As the Han Chinese expanded into South China, the Yao retreated into the highlands between Hunan and Guizhou to the north and Guangdong and Guangxi to the south, and stretching into eastern Yunnan. Around 1890, the Guangdong government started taking action against Yao in northwestern Guangdong.
Laotian Civil War
During the Laotian Civil War, the Yao tribes of Laos had a good relationship with U.S. forces and were dubbed to be an "efficient friendly force". They fought in favour of the (South Vietnamese) government against the communists. This relationship caused the new communist Laotian government to target Yao tribal groups for revenge once the war was over. This triggered further immigration into Thailand, where the tribes would be put into camps along the Thailand-Laos border.
Immigration to the United States
After obtaining refugee status from the Thai government and with the help of the United Nations, many Yao people were able to obtain sponsorship into the United States (although many remain in Thailand). Most of the Yao who have immigrated to the United States have settled along the Western part of the U.S., mainly in Central and Northern California such as Visalia, Oakland, Oroville, Redding, Richmond, Sacramento, but also in parts of Oregon like Portland, Salem, and Beaverton as well as the state of Washington in Seattle and Renton. See Mien American for those identified as Mien.
Culture, society, and economy
The Yao people have been farmers for over a thousand years, mostly rice cultivation through plowing, although a few practice slash-and-burn agriculture. Where the Yao live nearby forested regions, they also engage in hunting.
The Yao celebrate their Pan Wang (King Pan) festival annually on the sixteenth day of the tenth lunar month. The festival celebrates the mythical original story of the Yao people, and has evolved "into a happy holiday for the Yao to celebrate a good harvest and worship their ancestors."
Daoism has historically been important to the Yao. Jinag Yingliang, in a 1948 study, argued that Yao religion was characterized by (1) a process of Han Chinese-influenced Daoisation (Chinese: 道教化; pinyin: Dàojiào huà); (2) the endurance of pre-Daoist folk religion; and (3) some Buddhist beliefs.
The description of Yao religion is similar to the definition of Chinese folk religion as described by Arthur Wolf and Steve Sangren. Scholar Zhang Youjun takes issue with claims of "strong Buddhist influence" on the Yao, arguing that "although Yao ritual texts contain Buddhist expression, the Yao do not believe in Buddhism at all. They are resolutely Taoist."
Groups and languages
- Hmong–Mien languages
- Mienic languages (simplified Chinese: 勉语; traditional Chinese: 勉語; pinyin: Miǎnyǔ), including:
- Mian–Jin languages
- Dzao Min, 60,000 speakers 
- Biao Min, 43,000 speakers 
- Hmongic languages
- Mienic languages (simplified Chinese: 勉语; traditional Chinese: 勉語; pinyin: Miǎnyǔ), including:
- Lakkja language (a Tai–Kadai language)
- about 500,000 Yao speak Chinese dialects
In addition to China, Yao also live in northern Vietnam (where they are called Dao), northern Laos, and Myanmar. There are around 60,000 Yao in northern Thailand, where they are one of the six main hill tribes. The lowland-living Lanten of Laos, who speak Kim Mun, and the highland-living Iu Mien of Laos are two different Yao groups. There are also many Iu Mien Americans, mainly refugees from the highlands of Laos. The Iu Mien do not call themselves "Yao". Not all "Yao" are Iu Mien. A group of 61,000 people on Hainan speak the Yao language Kim Mun; 139,000 speakers of Kim Mun live in other parts of China (Yunnan and Guangxi), and 174,500 live in Laos and Vietnam.
The Bunu people call themselves Nuox [no13], Buod nuox [po43 no13], Dungb nuox [tuŋ33no13], or their official name Yaof zuf [ʑau21su21]. Only 258,000 of the 439,000 people categorised as Bunu in the 1982 census speak Bunu; 100,000 speak the Tai–Kadai Zhuang languages, and 181,000 speak Chinese and the Tai–Kadai Bouyei language.
Mao Zongwu (2004:7-8) gives a detailed list of various Yao endonyms (i.e., self-designated names) and the Chinese names of various groups and clans associated with them. Endonyms are written in the International Phonetic Alphabet with numerical Chao tones.
- Autonym mjen31 勉 or ju31 mjen31 优勉: Pangu Yao 盘古瑶, Pan Yao 盘瑶, Panhu Yao 盘瓠瑶, Trans-Mountain / Guoshan Yao 过山瑶, Large-Board / Daban Yao 大板瑶, Small-Board / Xiaoban Yao 小板瑶, Board / Ban Yao 板瑶, Top-Board / Dingban Yao 顶板瑶, Sharp-Headed / Jiantou Yao 尖头瑶, Level-Headed / Pingtou Yao 平头瑶, Red-Head / Hongtou Yao 红头瑶, Arrow-Pole / Jian'gan Yao 箭杆瑶, Cattle-Horn Yao / Niujiao 牛角瑶, Tu Yao 土瑶 (in Hezhou, Guangxi), Native / Bendi Yao 本地瑶, Flowery / Hua Yao 花瑶 (in Yangshuo County, Guangxi), Ao Yao 坳瑶, Zheng Yao 正瑶, Liang Yao 粮瑶
- Autonym kim33 mun33 金门 or kem53 di35 mun21 甘迪门: Blue-Indigo / Landian Yao 蓝靛瑶, Shanzi Yao 山子瑶, Flowery-Headed / Huatou Yao 花头瑶, Sand / Sha Yao 沙瑶, Level-Headed / Pingtou Yao 平头瑶, Bazi Yao 坝子瑶
- Autonym bjau31 mɔn31 标曼 or ɕi31 mun31 史门: Min Yao 民瑶, "Four Great" Min Yao 四大民瑶
- Autonym bjau31 min31 标敏 or tɕau44 koŋ55 meŋ55 交公勉: East Mountain / Dongshan Yao 东山瑶 (in Quanzhou County, Guangxi), Dog-Headed / Goutou Yao 狗头瑶
- Autonym dzau53 min53 藻勉: Bapai Yao 八排瑶
- Autonym ju21 ŋjɛn25 优念, pjoŋ31 toa53 jeu31 炳多优, or ʂan33 tɕai33 珊介: Red Yao 红瑶 (in Longsheng Various Nationalities Autonomous County, Guangxi), Plains / Pingdi Yao 平地瑶
- Autonym pu53 nu25 布努: Beilou Yao 背篓瑶, Beilong Yao 背陇瑶, West Mountain / Xishan Yao 西山瑶, East Mountain Yao / Dongshan 东山瑶 (in Bama Yao Autonomous County, Guangxi), Tudi Yao 土地瑶, Tu Yao 土瑶 (in Pingguo County and Mashan County, Guangxi), Mountain / Shan Yao 山瑶, Man Yao 蛮瑶, East Valley / Dongnong Yao 东弄瑶, West Valley / Xinong Yao 西弄瑶, Fan Yao 反瑶, Anding Yao 安定瑶, White Yao 白瑶, Black Yao 黑瑶, Black-Trouser / Heiku Yao 黑裤瑶, Long-Shirt / Changshan Yao 长衫瑶
- Autonym nau35 klau42 瑙格劳 or pou22 nou12 包诺: Siting Yao 四亭瑶, Situan Yao 四团瑶
- Autonym kjɔŋ33 nai33 炯奈: Hualan Yao 花蓝瑶
- Autonym pa31 ŋ̊ŋ35 巴哼: Dog Yao 狗瑶, Eight-Surname / Baxing Yao 八姓瑶, Red Yao 红瑶 (in Liping and Congjiang Counties of Guizhou; Rongshui Miao Autonomous County and Longsheng Various Nationalities Autonomous County of Guangxi), Wood Yao 木瑶
- Autonym m̥n33 nai33 唔奈: Flowery Yao 花瑶 (in Longhui, Dongkou, Chenxi, and Xupu County and the Tongdao Dong Autonomous County of Hunan)
- Autonym ʑou13 nɔ13 优诺: Red Yao 红瑶
- Autonym lak25 kja25 拉珈: Tea Mountain / Chashan Yao 茶山瑶
Groups considered to be "Plains Yao" (Pingdi Yao 平地瑶) include:
- Autonym Bingduoyou 炳多尤 (Pingdi Yao 平地瑶, Dainaijiang 代奈江): in Jianghua Yao Autonomous County 江华 of Hunan; Gongcheng 恭城, Fuchuan 富川, Zhongshan 钟山, and Lingui 临桂 counties of Guangxi
- Autonym Yeheni 爷贺尼 (Pingdi Yao 平地瑶): in Jianghua Yao Autonomous County 江华, Hunan (Jianghua County Almanac). The Yeheni speak a divergent Chinese dialect. It is spoken in Taoxu Town 涛圩镇 and Helukou Town 河路口镇 in Jianghua County, Hunan.
- Autonym Younian 优念 (Pinghua-speaking Red Yao 平话红瑶; ʑou13 ȵen13): in Longsheng 龙胜 and Guanyang 灌阳 counties of Guangxi. According to Chen Qiguang (2013:30), the ʑəu21 ȵien21 number about 10,000 speakers in Sishui 泗水, Madi 马堤, Mengshan 孟山, Jiangliu 江柳, and other locations of Longsheng County.
- Autonym Shanjie 珊介 (Shanzi Yao 山仔瑶): in Fangcheng 防城, Guangxi
- Autonym Youjia 优嘉 (Yaojia 瑶家): in Guanyang County 灌阳, Guangxi
- Jingdong Yao 景东县瑶族 (autonym: Lewu people 乐舞人): Jingdong County 景东彝族自治县, Yunnan. According to the Jingdong County Almanac (1994:519), ethnic Yao numbered 3,889 individuals in 1990, and lived mainly in Chaqing 岔箐 and Dasongshu 大松树 of Taizhong 太忠乡.
- Mienic groups
- Iu Mien: Black Dao of Dien Bien and Lai Chau; Red Dao of southern Lao Cai, Yen Bai, and Son La
- Kim Mien: Dao Tà Pán 大板瑶 (Dao Đại Bản, Dao Coóc Ngáng, Dao Sừng) of Ha Giang, Cao Bang, and Yen Bai; Red Dao of northern and eastern Lao Cai; Hongtou Red Dao 红头瑶 in northern Lai Chau
- Kiem Mien: Red Dao of Sa Pa
- Kam Mien: Coin Dao of Ha Giang, Cao Bang, Tuyen Quang, Thai Nguyen, and Bac Can
- Kem Mien: Coin Dao of Hoa Binh and Son La
- Quần Chẹt Mien: Hoa Binh, Son La, Tuyen Quang, Bac Can (also called the Dao Nga Hoàng, Dao Sơn Đầu)
- Lô Gang Mien: Dao Lô Gang and Dao Đầu Trọc of Ha Giang, Cao Bang, Lang Son, and Mong Cai
- Kim Mun groups
- Kim Mun: Dao Làn Tiển 蓝靛瑶 (including the Dao Tuyển, Dao Áo Dài, and Dao Đầu Bằng)
- Kim Meun: Dao Quần Trắng 白裤瑶 and Dao Thanh Y 青衣瑶
According to Doling (2010), only Kim Mun, Kim Mien, and Lô Gang may be found outside Vietnam.
Nguyen (2004:14-15, 128) lists Đại Bản, Tiểu Bản, Khố Bạch, and Làn Tiẻn as the 4 primary subdivisions of ethnic Yao in Vietnam.
- Đại Bản
- Dao Đỏ (Hùng Thầu Dào, Dao Coóc Ngáng, Dao Quý Lâm): located in Yen Bai, Lao Cai, Lai Chau, Tuyen Quang, Ha Giang, Cao Bang, Bac Kan, Thai Nguyen
- Dao Quần Chẹt (Dao Sơn Đầu, Dao Tam Đảo, Dao Nga Hoàng): located in Hoa Binh, Ha Tay, Phu Tho, Vinh Yen, Son La, Yen Bai
- Dao Thanh Phán (Dao Coóc Mùn, Dao Đội Ván, Dao Lô Gang, Dao Dụ Kiùn, Dao Thêu): located in Tuyen Quang, Bac Kan, Thai Nguyen, Lang Son, Quang Ninh, Bac Giang
- Tiểu Bản
- Dao Tiền (Dao Đeo Tiền): located in Hoa Binh, Phu Tho, Son La, Tuyen Quang, Cao Bang, Bac Kan
- Khố Bạch
- Dao Quần Trắng: located in Yen Bai, Lao Cai, Tuyen Quang, Ha Giang (known as Dao Họ in Yen Bai, Lao Cai)
- Làn Tiẻn
- Dao Thanh Y: located in Tuyen Quang, Bac Giang, Quang Ninh
- Dao Áo Dài (Dao Tuyển, Dao Chàm, Dao Slán Chỉ): located in Yen Bai, Lao Cai, Tuyen Quang, Ha Giang, Bac Kan
- Libo County: townships of Yaoshan 瑶山, Yaolu 瑶麓, and Yao'ai 瑶埃
- Shiqian County (2,522 people): 9 Yao villages including Leijiatun 雷家屯 and Wurongguan 乌荣关 of Beita Township 北塔乡, and Shuiwei Village of Huaqiao Township 花桥乡水尾村
- Wangmo County: the 4 villages of Shangyoumai 上油迈, Xiaoyoumai 下油迈, Xinzhai 新寨, and Jiaxian 加现 in Youmai Township 油迈瑶族乡
- Majiang County: 23 Yao villages in Longshan Township 龙山乡, including Heba 河坝 (with 6,474 people)
- Liping County
- Shunhua Township 顺化瑶族乡 (1,316 people in 1992): Gongcun 贡村, Gaoka 高卡, Yibuwan 已补晚, Yishu 已树; Gaozizhai of Gaoshu Village 高抒村高仔寨
- Leidong Township 雷洞瑶族水族乡 (1,576 people in 1992): Jinchengzhai 金城寨 and Yibizhai 已毕寨 of Jincheng Village ���城村, Sanshanzhai of Xilao Village 戏劳村三山寨; Cenpangzhai 岑胖寨, Nongbozhai 弄播寨, Yunnanzhai 云南寨
- Congjiang County: 2 subgroups of Red Yao 红瑶 and Pan Yao 盘瑶
- Red Yao 红瑶
- Cuili Township 翠里瑶族壮族乡: Gaomang 高忙, Xinzhai 新寨, Shujiawan 舒家湾, Wucai 乌菜, Jiage 架格, Baiyanchong 白岩冲, Raojia 饶家
- Jiabang Township 加榜乡: Dazhou 达州村
- Pan Yao 盘瑶
- Xishan Township 西山镇: Cengang 岑杠, Gaojiao 高脚, Qiuka 秋卡
- Douli Township 斗里乡: Dengmian 登面, Changka 长卡, Gaoliu 高柳, Beitong 碑痛
- Xiutang Township 秀塘壮族乡: Dage 打格, Yusha 雨沙, Jiujia 九甲, Baidao 摆倒, Wubu 乌���, Xilin 细林
- Zaibian Township 宰便镇: Zezhui 怎追
- Xiajiang Township 下江镇: Huanglang 黄郎
- Yongli Township 拥里乡: Dashan 大山, Laozhai 老寨, Gangbian 刚边, Huangnijing 黄泥井
- Donglang Township 东郎乡: Baidui 摆堆
- Red Yao 红瑶
- Rongjiang County
- Tashi Township 塔石瑶族水族乡 (2,979 people): Zedong 怎东村, Zaiyong 宰勇村, Dangxiang 党相村, Tashi 塔石村, Dangdiao 党调村, Zeba 怎贝村, Qiaoyang 乔央村.
- Pingjiang Township 平江乡: Jijiaoba 鸡脚坝, Balu 巴鲁
- Pingyong Township 平永镇: Sanbuqiao 三步桥, Qiaohai 乔亥
- Sanjiang Township 三江乡: Wuhong 乌洪
- Liangwang Township 两汪乡: Cen'ao 岑熬
- Pingyou Township 平尤乡: Shuangxikou 双溪口, Bakai 八开
- Leishan County
- Dadi Township 达地镇: Longtanggou 龙塘沟, Paisong 排松, Pingzhai 平寨, Laozhai 老寨, Beilue 背略, Pangjia 庞家, Jieli 皆力, Gaolue 高略, Tongwu 同乌, Yeliao 也辽, Xiaowu 小巫, Baimizhai 白米寨, Hebian 河边
- Liuwu Township 柳乌乡: Liuwu 柳乌
- Qiaosang Township 乔桑乡: Xiagaojian 下高枧
- Gulu Township 固鲁乡: Nanping 南屏
- Danzhai County: Pailu 排路, Yangwu 杨武, Jiapei 加配
- Jianhe County: Zhandi Village, Taiyong Township 太拥乡展迪村
- Sandu County: Wuxia 巫不, Pu'an 普安, Jiaxiong 甲雄, Shangjiang 上江, Niuchang 牛场
- Luodian County: Ankang 安抗 of Luotuo 罗妥; Naji 纳吉, Nakao 纳考, Nanao 纳闹, Luoyang 罗羊, Longping 龙坪, Bianyang 边阳 of Fengting 风亭
- Ziyun County (297 people): Tangguan Village, Maoping Township 茅坪塘贯村
- Guanling County (189 people)
The Yao of Guizhou have various autonyms, such as:
- toŋ55 mo55 (董蒙), in Yaoshan 瑶山, Libo County. The Buyi people call them ʑou21.
- nu55 hou33 (努侯), in Yaolu 瑶麓, Libo County. The Shui people call them miou35 lo55.
- tuŋ33 muŋ33 (东蒙), in Yao'ai 瑶埃, Libo County. The Buyi people call them ʑou21.
- maŋ55 (满), in Youmai 油迈, Wangmo County.
- ʑoŋ21 min21 (容棉), in Rongjiang, Leishan, Danzhai, Jianhe, Congjiang, and Sandu Counties.
Some subgroups of ethnic Yao in Hunan include:
- Pan Yao 盘瑶 (Mian 勉): in Jianghua, Chenxian, Lanshan, Ningyuan, Daoxian, Guiyang, Lingling, Chengbu, Chenxi, Xinning; speak a Mienic language.
- Guoshan Yao 过山瑶: in Jianghua, Lanshan, Ningyuan; speak a Mienic language.
- Huajiao Yao 花脚瑶 (Wunai 唔奈): in Longhui, Tongdao, Xupu, Chenxi; speak a Hmongic language.
- Badong Yao 八峒瑶 (Batong Yao 八垌瑶): in Xinning. The Badong Yao speak an endangered Sinitic language. It is spoken in the villages of Huangyandong 黄岩峒, Malindong 麻林峒, and Dazhendong 大圳峒 in Huangjin Ethnic Yao Township 黄金瑶族乡, Xinning County.
- Pingdi Yao 平地瑶 (Bingduoyou 炳多尤): in Jianghua, Jiangyong, and speak a Chinese dialect.
- Qixing Yao 七姓瑶: in Chenxi, and speak a Chinese dialect.
The Hunan Province Gazetteer (1997) gives the following autonyms for various peoples classified by the Chinese government as Yao.
- ju21 mien21 尤棉: in much of Xiangxi Prefecture
- tom21pen21 ju21 董本尤: in Xintian County, Yizhang County, Changning County
- ku21goŋ55 ju21 谷岗尤: in Lanshan County, Jianghua County
- thou21 ju21 土尤
- dzau21 min21 藻敏: in Shuangpai County, Dao County, Ningyuan County
- Donglixiao 洞里销: in Xinning County; also called Bunu 布努, Donglixiao 峒里俏, or Dong Yao 峒瑶 (Xinning County Gazetteer 2009). Their language is called Donghua 峒话.
- mm21 nai33 唔奈: in Longhui County, Xupu County
- piŋ21 toa52 jeu21 炳多尤 (also called Dainaijiang 代奈江): in Jianghua County, Jiangyong County
Tan Xiaoping (2012) also gives the following autonyms for Yao subgroups of Jiangyong County.
- mjəŋ31 勉
- jəu31 mjən31 优勉
- i31 mjəŋ31 壹勉
- iou231 ȵie231 优尼
- piu42tau42 iou42 炳多优
The Yao of Shaoyang Prefecture are found in the following locations (Shaoyang Prefecture Gazetteer 1997). Population statistics are from 1990.
- Xinning County (12,756 Yao persons): Malin 麻林乡, Huangjin 黄金乡, Jingwei 靖位乡 (in Yuanshui 源水瑶族村)
- Dongkou County (8,473 Yao persons): Naxi 𦰡溪乡 (那溪乡), Changtang 长塘乡, Dawu 大屋乡; Yuexi 月溪, Zhaping 渣坪, Tongshan 桐山
- Longhui County (6,151 Yao persons): Huxingshan 虎形山乡, Mao'ao 茅坳乡, Xiaoshajiang 小沙江镇, Qingshan 青山, Matangshan 麻塘山
- Chengbu County (2,276 Yao persons): Lanrong 兰蓉, Qingyuan 清源, Dayang 大阳, Tingping 汀坪, Pengdong 蓬洞, Yangmei 杨梅
- Suining County (1,641 Yao persons): Jinta 金趿, Shuikou 水口
The Shaoyang Prefecture Gazetteer (1997) reports that the Yao of Shaoyang Prefecture, Hunan speak the following languages.
- Mienic languages
- Hmongic languages?: Huangjin 黄金 and Malin 麻林 of Xinning County
- Southern Dong dialect: Naxi 𦰡溪 (那溪), Dongkou County and Lianmin 联民, Suining County
The following population statistics of ethnic Yao in Hunan are from the 1990 Chinese census, as given in the Hunan Province Gazetteer (1997).
- County-level distribution of the Yao 2000 census
(Only counties or county equivalents with more than.1% of county population are shown.)
|Jihua Yao autonomous county||61,87||270,889||437835|
|Ruyuan Yao autonomous county||10,75||19,121||177894|
|Lianshan Zhuang Yao autonomous county||14,33||14,195||99070|
|Liannan Yao autonomous county||52,29||69,968||133814|
|Guangxi Zhuang autonomous region||3,36||1,471,946||43854538|
|Longshenggezu autonomous county||17,56||28,237||160796|
|Gongcheng Yao autonomous county||58,60||158,937||271216|
|Sanjiang Dong autonomous county||3,88||11,798||304,149|
|Rongshui Miao autonomous county||6,48||27,560||425,608|
|Jinxiu Yao autonomous county||37,45||50,532||134,934|
|Fuchuan Yao autonomous county||52,91||144,705||273,507|
|Luocheng Mulao autonomous county||1,21||3,903||322,116|
|Huanjiang Maonan autonomous county||5,36||17,807||332,067|
|Bama Yao autonomous county||17,24||37,706||218,724|
|Du'an Yao autonomous county||21,66||117,609||543,019|
|Dahua Yao autonomous county||21,46||78,963||367,970|
|Honghe Hani Yi autonomous prefecture||1,86||76,947||4,130,463|
|Jinping Miao Yao Dai autonomous county||12,00||37,937||316,171|
|Hekou Yao autonomous county||22,10||21,097||95,451|
|Wenshan Zhuang Miao autonomous prefecture||2,50||81,774||3,268,553|
|Jingdong Yi autonomous county||1,15||4,063||352,089|
|Jiangcheng Hani Yi autonomous county||3,94||3,946||100,243|
|Xishuangbanna Dai autonomous prefecture||1,88||18,679||993,397|
After 1982, the Guangxi Nationality Institute and the Chinese Academy of Social Sciences together created a new Yao writing system which was unified with the research results of the Yao-American scholar Yuēsè Hòu (Traditional Chinese: 約瑟·候/Simplified Chinese: 约瑟·候). The writing system was finalized in 1984 in Ruyuan County( Chinese characters: 乳源瑤族自治縣）, Guangdong, which included Chinese professors Pan Chengqian (盤承乾/盘承乾), Deng Fanggui (鄧方貴/邓方贵), Liu Baoyuan (劉保元/刘保元), Su Defu (蘇德富/苏德富) and Yauz Mengh Borngh; Chinese government officials; Mien Americans Sengfo Chao (Zhao Fuming), Kao Chiem Chao (Zhao Youcai), and Chua Meng Chao; David T. Lee.
American linguist Herbert C. Purnell developed a curriculum and workshop presentations on language learning in East and Southeast Asia, as well as Yao Seng Deng from Thailand. The US delegation took the new writing system to the Iu Mien community in the United States where it was adopted with a vote of 78 to 7 by a conference of Mien American community leaders. This writing system based on the Latin alphabet was designed to be pan-dialectal; it distinguishes 30 syllable initials, 121 syllable finals and eight tones.
For an example of how the unified alphabet is used to write Iu Mien, a common Yao language, see Iu Mien language.
Some people think that a variety of Yao is, or was, written in Nüshu, an indigenous script in Southern part of Hunan Province in China. But this connection between Yao language and Nüshu is disputed, because Nüshu more likely recorded local Chinese dialect which might be also known by Yao people in Hunan.
Officially illiteracy and semi-literacy among the Yao in China still stood at 40.6% in 2002.
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