The ethnic issue is an important subject in current academic circles,which was related to several conflicts at home and abroad.The study of ethnic identity is the basis and the difficulty of ethnic studies.As a kind way of inter-ethnic communication,the impact of tourism on ethnic identity should be a great concern,especially on the destination communities,as a result of the booming of tourism.The current study of tourism impact on ethnic identity of destination communities focused more on the destinations which take ethnic culture as its main tourism attractions,where the residents' ethnic identity might be misled by commercial advertising.So this study chooses the Hui minority community in Sanya of Hainan as a case destination,which is not taking ethnic culture as its main attraction. In order to investigate the changes of the residents' ethnic identity before and after tourism development,this article takes cultural anthropology's research strategy and uses observations,interviews and documentation analyze as research methods and finds that the residents'' main occupations related to tourism include tourism commodity selling,tourism transportation business and tourism catering business.This study also finds that tourism development does impact local residents' ethnic identity.Some conclusions can be drawn as follows.Firstly,religious awareness has been enhanced.Thanks to tourism participation,the Hui people have got much more earnings than before and could afford the expense of hajj and studying overseas in Islamic countries,thus,transit the architectural style of mosque and folk residences from Chinese to Arabian,and enlarge the mosques to meet the needs of educational and cultural functions. Secondly,traditional customs have changed.The status of working women has promoted due to the women's participation in tourism business,and the marriage taboos got loosened.Along with the necessity of tourism development,the cigarette and alcohol taboos has also got loosened and the frequency of salat decreased. Thirdly,the difference of tourism participation causes the differentiation of employment,which makes the community identity not as united as before.