In the Open Times(the 5thissue of 2022), Jian Zhixiang and Ma Rong remarked that the study of ethnic issues in China cannot be separated from discussions on the core concept of "Minzu (民族)"."Minzu (民族)" became part of China’s discourse system after the Opium War. Due to cultural differences between this concept and the Chinese civilization & tradition, Chinese people have had various understandings and application of this concept over the one hundred years. Nowadays the interaction between ethnic groups is being enhanced, and the geographical distribution pattern and social roles of ethnic population are undergoing profound historic changes. If the core concept of "Minzu (民族)" cannot be clearly defined with continued ambiguity and multiple meanings, our related theory, system and policy will always be in dispute.