Wireless Sensor Network (WSN) consists of sensor nodes and base station. In WSN, reduction of energy and extension of network lifetime are important facts. In this paper, LEACH (Low-Energy Adaptive Clustering Hierarchy) which is a hierarchical routing protocol, is improved. Weight exponent of network, residual energy of the nodes, SCHs (Supporting Cluster Head) and also distance to CH (Cluster head) and SCH are considered in the proposed scheme which is RF-LEACH or refined LEACH. Based on network lifetime a comparison between LEACH, LEACH-SCH and RF-LEACH protocol is analyzed. The implementation is done using MATLAB 2013a. From the simulation results, it can be concluded that the proposed scheme is better than LEACH and LEACH-SCH.