In recent years, China is in a new stage of rapid urbanization. The phenomenon of multi network integration of public transport network and subway network has appeared in urban transportation network. How to build a three-dimensional integrated, intelligent and efficient modern comprehensive transportation system has become a new proposition of the times. From the perspective of complex network, through network modeling and feature analysis, this paper studies the collaborative relationship between public transport network and subway network, studies the improvement of network performance by composite transportation network, analyzes the combination of public transport network and subway network in Shanghai from the perspective of network topology parameters, and studies the impact of the combination of different transportation networks on the overall transportation network.