Interchange is an important link in the urban transport system, but the problem of inefficient travelling of urban residents has not been improved. In this paper, we take the metro-transit composite network in Putuo District, Shanghai as the research object, use Space-L model to construct the metro-transit composite network with walking as the transfer mode and walking plus shared bicycle as the transfer mode respectively, study the basic topological properties of the metro-transit network and compare the network characteristics of the composite network with different transfer modes. The results show that the average degree value, network density, local efficiency and global efficiency of the composite network with two modes of transfer are higher than that of the composite network with walking as a single mode of transfer, and it also proves that the two modes of transfer cooperate with each other, so that the whole public transport system can play a greater efficiency.