Liu Sida, 1980 was born in Beijing and his ancestral home was in Yunnan. Doctor of Sociology, University of Chicago, Bachelor of Laws, Peking University. He is currently an assistant professor in the Department of Sociology and Law School of the University of Wisconsin-Madison, and a researcher at the American Lawyers Foundation. The main research directions are sociology of law and sociology of occupation. In recent years, he has been devoted to the empirical study of the legal profession in China. He has been engaged in social science in China, Chinese and foreign law, sociology research, social theory, Peking University law review, Tsinghua rule of law, law and social science, Jiaotong University law, law&; Social criticism, law and literature. Social Survey, China Quarterly, Wisconsin Law Review, Fordham Law Review and Yearbook of Law and Administration. Academic journals such as Social Sciences and Symbolic Interaction have published more than 20 papers in Chinese and English, including The Lost City-State: Changes of the Legal Profession in Contemporary China (Peking University Press, 2008 edition), The Logic of Separatism: An Ecological Analysis of the Legal Service Market in China (Shanghai Sanlian Bookstore, 2010/edition), and.