Abstract: Wireless sensor network consists of spatially distributed sensor nodes which sense physical and environmental condition like sound, pressure, temperature etc and pass the data to the main location through the network. In WSN network life time and node energy efficiency are two most important terms. One major issue in wireless sensor networks is developing an energy-efficient routing protocol which has a significant impact on the overall lifetime of the sensor network. Clustering based Energy efficient LEACH (Low-Energy Adaptive Clustering Hierarchy) protocol can effectively increase WSN performance by dynamically changing cluster head. This paper surveys working of LEACH protocol, its limitations and advancements done in LEACH to improve its performance.