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Wireless Sensor Networks (WSNs) consist of small nodes with sensing, computation, and wireless communications capabilities. Many routing protocol have been specifically designed for WSNs. And energy awareness is an essential design issue. In this paper, We study the routing protocol of wireless sensor network and describe the ZigBee based wireless sensor network architecture, analyze the principles of tree-structured routing and AODV routing, and then apply Zigbee technology to intelligent parking system.