Abstract: Vehicle ad-hoc network (VANET) with large scale and node distribution and the characteristics of mobility,networking of VANET technology has become a research focus in the field.For urban traffic environment,this paper proposes a clustering structure of VANET network scheme,using a bus as a cluster head,dynamic cluster head election,dynamic management of cluster members,In terms of network connectivity,this paper discusses the use of roadside parked vehicle cache forwarding strategy,Theoretic analysis and simulation results show that proposed scheme can effectively extend the time of communication,improve the transmission efficiency.