How to use the limited transmission opportunity to transmit the information of the vehicle service perception reliably is the "bottleneck" problem in the development of intelligent transportation. By utilizing the motion law of vehicles in public transport, the hop by hop message forwarding mechanism based on opportunistic contact between nodes was put forward. And in combination with the characteristics of the public transport system, the cooperative Delay and Tolerant Network (DTN) routing strategy (TF) based on urban public transport mobility model was designed. Firstly, according to the characteristics of public transportation mobile model itself, such as bus, intercity bus nodes were grouped based on their motion paths, and a packet DTN routing algorithm based on fixed moving path was proposed. Then the taxi, human nodes were defined as free nodes, and a kind of DTN routing strategy based on forward factor control was designed as a supplement to the packet routing mechanism. The simulation results show that compared with the Epidemic, Prophet and Spray And Wait (SAW) routing algorithms, TF routing algorithm has higher message delivery ratio and lower average delay.