There are not only differences between the ethnic identity and national identity,the two most important group identities,but there are also connections between them. How to realize the integration of these two identities is directly related to national unity and social stability. Various governments in the multi-ethnic countries employ various theories to guide the construction of national identity in their home countries,forming several relatively typical modes. It boasts important theoretical and practical significances for China,one of the multi-ethnic countries,to realize the harmonious co-existence between ethnic identity and national identity by analyzing the theory and practice and drawing experiences and lessons in other countries in dealing with the relations of ethnic identity and national identity.