Abstract: In order to rationally assign and utilize wireless channel resources, various multi-radio and multi-channel channel assignment algorithms for wireless Mesh network have been proposed. In this paper, an improved algorithm based on connected low interference channel assignment (CLICA) is presented to improve network capacity (throughput). The interference measure of each unit in the network is calculated based on the level of interference of each link in the network. The throughput of the network is improved by reducing the network interference level. The optimal channel assignment can be achieved by using mathematical optimization model of the channel assignment.