From a historical point of view,multiculturalism is closely related to the right of minorities to pursue justice at the beginning of the formation. The current research presents two features:The first is that there is no strict division of the dimensions of multiculturalism. Secondly,most scholars regard multiculturalism as the theory of minority rights,but not from the perspective of the construction of multi-national countries to understand the importance of multiculturalism. This paper argues that multiculturalism has at least four dimensions. In each dimension, the position of minority rights has different contents,value and practical effect. The protection and maintenance of the rights of the minority nationalities and the construction of the multi nation state are two important aspects of the same historical process.