Abstract: In order to improve the comprehensive performance of Ad Hoc network and satisfy the application the need to Hd Hoc network in different fields, a Ad Hoc network optimization method was proposed based on fuzzy set theory (FST). And an evaluation index set and degree standard set were also constructed, which contain the relative degree of new overlay network node number and the relative degree of residual energy, and the relative weight to evaluation index was defined. The relation synthesis algorithm rules of fuzzy set theory were applied to optimize the replay packet for Ad Hoc network. Based on network simulator NS-3, a simulation test of FSTA and BCAST was conducted. Comparing and evaluating the capability about network lifetime, packet loss and network throughput, results show that FSTA is more excellent than BCAST, verify the FSTA validity on Ad Hoc network optimization and improvement performance of Ad Hoc network.