With the continuous development of wireless sensor network technology, more and more fields need to use it. But node carrying capacity is limited in the network, causing the problem of short lifetime. It also restrict the widely used of this technology. LEACH algorithm is now widely used in wireless sensor network protocol. It improved the node energy consumption effectively, but the cluster in the algorithm is adaptive random, lack of considering the current node's energy and cluster distribution balance. So it may make the network energy loss uneven, lead to network premature death. This article combine theoretical analysis and simulation verification. For LEACH agreement clusters process, introduced into optimal cluster, dual cluster head to transmit data and other methods to prolong the network lifetime, balance energy consumption of nodes in the network, The experimental results show that, the improved method effectively reduces the network energy consumption, ensure the network load balance, and prolong the life span of the network.