Abstract: The change of political and legal discourse since the founding of new China is first reflected in the constant change of its concept denotation, that is, the relationship between "words and things". At present, the concept of politics and law basically refers to trial, prosecution, public security, national security and judicial administration. But in the past few decades, the concept has also covered legislative, civil affairs, ethnic and supervisory matters. The change of political and legal discourse embodies the re-establishment and continuous shaping of discourse-power relations. The Communist Party of China has established political and legal organs at all levels, established the legal ideology of Marxism-Leninism, and formed a set of political and legal discourses, including the People, Class, Dictatorship, National Security, Two kinds of Contradictions, Social Governance and other key words. Political and legal discourse is first of all a summary of the revolutionary experience. The most solid content of which is the Leadership of the Communist Party of China has been written into the Constitution. Therefore, the political and legal discourse is fundamentally consistent with the constitutional discourse. In turn, the two discourse can also play their respective functions and together be as part of the discourse of the socialist rule of law system.