Abstract:According to the legislative comments of NPC Legal Standing Committee, autonomous legislation essentially is a type of local laws and regulations which does not involve the matters that the National People' s Congress need to stipulate by legislation and having or having not local characteristics is not the necessary part of autonomous legislation. Based on this clarification, the identification and demonstration of legislative facts in the process of local autonomous legislation can be divided into two parts:the identification and demonstration of institutional fact about the matters which the National People' s Congress need not to stipulate by legislation and the matters of " urban-rural construction and management ,environmental protection and historical and cultural protection" which the city with districts has the legislative competence to stipulate by legislation; the identification and demonstration of natural and social fact about the affairs with or without local characteristics. Further speaking, the local legislature should pay high attention to some official data such as central files ,formal legislation ,reply to inquiries about laws, legislation draft, legislation plan and so on in the process of the identification and demonstration of institutional fact and pay high attention to some facts about objective law ,causal relationship, social norms, information feedback and so on in the process of the identification and demonstration of natural and social fact. In the end, in order to improve the quality of autonomous legislation, the local legislature should take some necessary steps to obtain legislative facts information with high quality in the whole process of local legislation ,reduce the cost of searching and processing legislative facts information by artificial intelligence and big data and exploit the potentialities of existing channels of legislative participation.