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Mobile Ad Hoc Network (MANET) has several characteristics, self-organization, dynamic topology, multi-hop communication and distributed coercion. And it can be applied in small area battlefields or post-disaster scenes. Because the energies of nodes usually are limited, the survival time of network is very short; it is an important direction of doing research to maximize the utilization of existing resources. According to the location of the monitoring areas and the nodes, the adaptive clustering algorithm divides the areas into several clusters. It is obtained that reasonable clustering structure based on the comparison of the LBF under different cluster numbers. By comparing with survival time of 100 nodes and energy variances in each round of three algorithms, it is concluded that the adaptive clustering algorithm obviously prolongs the network lifetime and balance the load of the cluster head than specified cluster head algorithm and cluster head rotation algorithm..