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Wireless sensor network (WSN) is a novel technology about acquiring and processing information. Data transmission can not work without routing protocol which is the base of network. Since WSN is a resource-constrained network, and particularly the energy is limited, the routing protocol must be energy efficient in order to prolong the lifetime of network. LEACH is researched and improved in the paper. The improvement of LEACH is based on cluster head selection and approach of cluster building. Both of algorithms are emulated in compute. The result of the emulations proves that the improved LEACH algorithm is much better than original LEACH algorithm in life time and energy consumption.