Wireless sensor networks consisting of a large number of small sensors with low-power transceiver can be an effective tool for apperceiving

collecting and computing data in a variety of environment.The collected data must be transmitted to the base station for further processing.Since a network consists of sensors with limited battery energy

the routing protocol must be energy efficient in order to prolong the lifetime of network.LEACH is researched and improved.The improvement of LEACH is based on communication between cluster heads and base station.Both of the algorithms are emulated in Matlab.The results of the emulations prove that the improved algorithm is much better than LEACH in lifetime and energy consume.