After the revision of the Legislative Law，the larger municipal legislative power was limited，and the overall legal structure was reset. Case analysis and comparative analysis can quickly grasp the change information of local regulatory structure，so as to understand the latest trends in local legislation. Through the analysis of the structural characteristics of local laws and regulations in the four districts locating in east，middle and west China and the problems still being upgraded，it is found that legislation about urban and rural construction and management have become the legislative focus areas of each city，but each of the four cities has its own emphasis. Chengdu pays attention to environmental protection legislation. Hangzhou city legislation concept is more advanced，which tries to explore innovative legislation. Guangzhou and Wuhan promotion-oriented legislation is more abundant. Through the comparison of the internal structure of regulations，it is concluded that the regulatory structure of Chengdu and Wuhan has significant correlation，and the correlatation of regulation structure with Hangzhou is the lowest. The former can provide legislative reference for Chengdu，while the latter can provide legislative innovation ideas for Chengdu.