The wireless sensor network has the characteristics of power-constrained and multihop routing.The paper present an energy-efficient algorithm for data broadcasting and gathering in the sensor networks.The main goal is to minimize the whole energy consumption.Simulation results show that the presented algorithm can effectively solve the problem

consumes only 20%-60% transmission power compared to that of the traditional algorithms

so prolongs 10%-100% network lifetime under the cases of different seneor numbers（10-50）.