The rolling bearing is one of the key parts of the locomotive running components, because it’s running status is directly related to the performance and safety of locomotive. In this paper, ZigBee Wireless Sensor Network (WSN) technology is introduced. The framework，hardware circuit and software layer of the sensor node was researched in detail. The characters of chips and the realization of Zigbee protocol stack also described．Then, the status monitoring system for the locomotive bearings based on WSN is designed. It can monitor the work status of the rolling bearing and realize to alarm for instant fault. This system can also be improved for the other vehicle.