Abstract:The last bus of urban traffic currently has the problems of low connection efficiency and low success rate. In order to solve this problem, the double-layer complex network model of the last bus transfer connection in subway-bus based on the actual operation schedule of the last bus is studied. Based on the study of the last bus connection in urban rail transit, a network representation of the last bus connection matrix is presented. Meanwhile, ucinet is used to calculate the values of network characteristic parameters (degree, shortest path, connection ratio) and we take them as evaluation indexes to measure the connection efficiency, frequency and success rate of the last bus transfer in the urban transportation network. Aiming at the stations with high transfer failure rate, the last bus schedule of the network is optimized by postponing the last bus time of their routes. Finally, taking Chengdu as a case study, it is systematically verified that joining the last bus network can significantly increase the degree of transfer stations, without increasing the shortest path, and the success rate of connection is significantly increased from 25.4% to 39.1%, which indicates that the last bus connection efficiency and success rate of the complex subway-bus double-layer network is superior to that of the urban rail transit network. And the delay of the last bus in the station with a higher failure rate increases the success rate of the last bus connection from 39.1% to 40.7%, which improves the connection condition of the last bus and the service quality of the last bus in the city.