Aiming at the shortcomings of traditional single-hop wireless network (WLAN) such as low scalability and poor robustness, this paper proposes a design method of wireless MESH network system based on OLSR protocol. Each subnet selects some nodes as multi-point relay nodes (MPR) of network control group sent by this node, they only process and do not forward, which significantly reduces the number of control groups broadcast for topology information of traditional proactive routing protocol network. Each MPR node reports only the link between itself and its MPR node, further reducing the network control overhead. This method has a high application prospect in the fields of urban digitization and urban wireless monitoring.