Abstract: As to some disruptive events in mobile sensor network,a QoS routing protocol is proposed(EQMR).EQMR protocol consists of three phrases: network initialization,route discovery and establishment,data communication and route maintenance.In the first phrase,network is divided into two parts: backbone network,sensing subnet.In the second phrase,related backbone node will find minimum-cost path among multiple disjoint paths.In the third phrase,data transmission and route maintenance are conducted for failure of route selection under ACK confirmation mechanism.Simulation result shows that EQMR protocol can make some improvements for the ratio of successful data delivery,data delay and network residual energy,compared to AODV protocol.