Abstract: There are three main approaches to the study of Badiou's whole thought in China:first, from the perspective of philosophy and its four premises, the main contents of Badiou's thought are summarized by discussing philosophy, mathematics, poetry, love and politics;the second is to start from the three key words of event, subject and truth, to sort out the relationship among the three, to summarize their value of the times;the third is to interpret communism from the radical idea of communism.In the specific meaning of ideas and actions, we attempts to give a reasonable evaluation of the idea of communism.Of course, in contrast to the three paths of studying Badiou's thought, how to evaluate and position his thoughts becomes a basic question that must be answered.In summary, although Badiou's thought was generated in a post-modern context, it cannot be called a post-Marxist, but should be grasped from a comprehensive perspective.More importantly, although Badiou's communism is a renewed update of Marx's communist theory, this update is a step back from Marx.