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Wireless Sensor Network (WSN) is one of the most significant technologies in the information era. WSN is composed of hundreds of nodes which have ability of sensing, actuation and communicating, has caused extensively studied all over the word. This article presents the advantage of WSN and analyses the application of WSN in Environment Monitoring. In addition, we explain why we choose ZigBee technology as the wireless communication approach. Finally, in the greenhouse of vegetable, we design a WSN project based on ZigBee technology using CC2430 board and verify the correctness and feasibility of the plan.