Legislative cooperation among local governments is a main method to resolve the local legislation fragmentation and construct the uniform and harmonious legal environment. This paper firstly explains the main body, form and legal boundary of legislative cooperation among local governments, and demonstrates the possibility and legality of cooperation, and then analyzes the constraint mode and contract mode of realizing legislative cooperation. Relative to constraint mode, contract mode has good operability because the impact of it upon present constitution system and administrative frame is lit...