In view of the high dynamic topology of ad hoc network and the busy degree of nodes, which leads to the increase of packet transmission delay and packet loss rate, the paper presents a protocol which is based on the idea of dispersed routing to avoid the delay and packet loss of trigger and retransmission, and adds delay algorithm to avoid the busy node being selected as the nodes of main path .Through simulation, different node rates are set, and the average delay and packet loss rate of AOMDV protocol and the improved protocol are compared. It shows that the improved routing protocol is better than the AOMDV protocol in terms of end-to-end delay and packet loss rate. Especially when the node moves faster than 30m/s, the performance of network transmission is significantly improved.