Single ZigBee network usually has only one single gateway. Single gateway system may have some problems, for example, network time delay caused by the large amount of data, and paralysis of the whole network due to the dysfunction of one gateway node. In order to solve these problems, the design method of multiple gateways in a single ZigBee network is proposed. Firstly, Data sending to the single gateway are divided into several parts and sent to multiple gateways. Then, gateways convert the received data and transmit them to the Ethernet. PC server gathers data via TCP/IP protocol and processes them eventually. The architecture and working principle of the designed multi-gateway system are introduced first. The hardware and software designs of the system are presented, and the route selection process for the best gateway is described in details. The final testing results indicate that the multi-gateway system works stably and can make up the deficiency of the single gateway ZigBee network effectively.