LEACH(Low Energy Adaptive Clustering Hierarchy) protocol has many shortcomings, such as the strong randomness of cluster heads' selection, not considering nodes' residual energy when selecting cluster heads. The defects of LEACH protocol will increase the energy consumption of the network and reduce the network lifetime. This paper proposes a new improved protocol named LEACH-CR(Low Energy Adaptive Clustering Hierarchy-Consumption Reduction)based on the research and analysis of LEACH protocol. LEACH-CR protocol takes many factors into consideration including the number, distribution, residual energy and distance to the base station of cluster heads. Finally, the outcome of MATLAB simulation indicates that the new protocol has effectively prolonged the lifetime of the network.