In order to overcome the negative factors due to the natural characteristics of wireless sensor networks（WSNs）such as dynamic network topology

the node of the WSNs with limited energy

and the battery that can not be supplied

a new quality of service（QoS）route discovery method which can meet the requirement of QoS and has better network lifetime is presented.The method utilizes the node selection system and node’s neighbor table to construct the set of candidate node in which the node’s left bandwidth can meet the requirement of the mission.So the number of the node which is supposed to be detected will reduce.In order to maximize the WSNs’s life

the genetic algorithm（GA） utilizes the energy estimate model and node energy consumption weight model which are constructed to adaptive deal with the nodes’s scheduling problem in WSNs.The simulations and the analysis show the choosing interval of the controlling parameters proposed by the GA algorithm.The experiment results show the QoS route discovery method with the implementation of best energy for WSNs has better adaptability and longer lifetime.