Stable driving of autonomous vehicles platoon is ensured by reliable real-time information transmission between vehicles. Aiming at the platoon architecture, which uses dedicated short range communication technology (DSRC) in VANETs, an analysis method of vehicle-to-vehicle communication networks performance is proposed. It mainly studies inter autonomous vehicles communication process of intra-platoon and the inter-platoon communication process in multi-platoon marshalling. It uses M/G/1/K queue model with limited length to analyze the queuing process of packet arriving at media access control layer, which is described through steady distribution of buffer states under different network loads. Subsequently, it derives communication characteristics under different vehicles location through the analysis method of Markov model considering idle state of buffer. Research results show that various factors including the network data flow, channel conditions, MAC layer buffer queuing process, contention channel process, and platoon parameters, have a substantial influence on packet transmission delay and packet loss probability of inter vehicles communication, and the delay of vehicle-to-vehicle communication based on DSRC satisfies string stability demand of platoon.