The purpose of this study is to explore new immigrants’ grown-up offsrings’ ethnic identity. After separating iterviewees into three groups and finding out how interviewees’ families background and life experences affect one’s ethnic identity by in-depth interviewing, I realize that there are four main factors as follow probably affect their ethnic identity: Firstly, whether these offsrrings' mothers transit their own culture to their children. Secondly, interaction between the interviewees and their ralatives on mothe's side. Thirdly their daily life experences in their mother’s hometown. Finally, political factor also have strength on these offsprings' ethnic identity, especially whose mothers come from China. Generally speaking, I consider that it is hard for interviewees, whose mother are from South-Asia, to build bi-ethnic identity. On the contrary, it is easier for interviewees, whose mother are Chinese-Indonesian, Chinese-Malaysian or Chinese, to develop bi-ethnic identity.