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This paper proposes a novel on-demand multipath routing protocol (AODVM-PSP) for a mobile ad hoc network. We devised a new multipath utilization method with probability selection, with which each node deliberately selects one of the multipath routes to utilize. We examined our protocol under various network loads. We evaluated our protocol with Omnet simulator and the performance is compared with conventional methods. When the network load is high, the number of the routing control packets is prodigious. The simulation results show that our proposed protocol has significant improvement over others in high load.