Abstract: As to some disruptive events in the heterogeneous sensor network, a QoS routing protocol is proposed (EQHR) .EQHR protocol consists of three phrases: In the first phrase, every node gets initial route table.In the second phrase, source 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 the ACK confirmation mechanism.Simulation result shows that EQHR protocol can make some improvements for the ratio of successful data delivery, data delay and network residual energy, compared to MM Speed, or AODV protocol.