At present, WSN (wireless sensor network) to provide monitoring results to users primarily through the wired networks, which can not be applied to some areas is not easy wiring. In this paper, a solution for the interconnection between WSN and WiMAX network based on gateway is proposed, which doesn't need to change the protocol and system structure of WSN and WiMAX network. The main function of the gateway is protocol conversion, address translation, service providing and so on. The experiment of communication between WSN and Simulated WiMAX network shows that WSN and WiMAX network can achieve stable and reliable communication via the gateway.