Abstract: In view of existing problem of traditional single path routing protocol in wireless mesh networks,an algorithm of multipath routing algorithm based on dynamic source routing protocol(IDSR) is proposed in this paper.By adding these two constraints,which are bandwidth and maximum number of forwarding,it will make the new algorithm easier to get several routing request information.It introduces the QoS routing cost function in node-disjoint multi-path selection process to realize multi-path selection effectively.Through providing multiple QoS guarantee,such as bandwidth,delay and cost,it will make the new algorithm have many characteristics such as relatively high solution efficiency,avoiding the instability of the single-path routing etc.The simulation results show that this algorithm achieves better QoS performance and more advantages over dynamic source routing protocol(DSR) and split multipath routing protocol(SMR).