A Wireless Sensor Network (WSN) consists of spatially distributed autonomous sensors tocooperatively monitor physical or environmental conditions, such as temperature, sound, vibration,pressure, motion or pollutants. In recent years, there has been a growing interest in wireless sensornetworks. One of the major issues in wireless sensor network is developing an energy-efficient routingprotocol. The challenge lies in efficiently providing acceptable accuracy while conforming to the manyconstraints of WSNs. Energy limited is one main bottle-neck for wireless sensor networks. Due tounreasonable cluster head electing and intensive energy consumption of cluster head in clusteringalgorithm, I propose cluster based partial multihop algorithm for heterogeneous WSN, Which aimed tooptimize cluster head voting and balance energy consumption of cluster head. I also propose ahierarchical tree routing method that reduces the distance of cluster-head to the base station
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