Coordinated legislation in the Chengdu-Chongqing economic circle is a core part of the national strategy to guarantee the construction of the Chengdu-Chongqing economic circle，which requires continuous experience and improvement in practice. In the process of coordinated legislation，Sichuan and Chongqing have summed up the useful experience of collaborating in the whole process of legislation by the Sichuan and Chongqing People’s Congress，collaborating in all aspects with the participation of multiple subjects，and fully negotiating on an equal footing. At the same time，there are also problems of lack of institutional design and normalized coordination mechanism specifically for collaborative legislation，lack of systematic legislative planning，narrow coverage of legislative fields，and lack of perfect legislative protection mechanism in both regions. In the process of collaborative legislation，it is possible to draw on the useful experience of legislative synergy in other regions in China，improve the current problems based on the actual situation of the two regions，and explore the optimal path of coordinated legislation in the Chengdu-Chongqing economic circle.