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This paper designs a novel wireless surveillance system in greenhouse, in order to solve long-existing problems in traditional systems, such as high maintenance cost, low robustness and mobility, etc. We firstly introduce the system architecture, with hardware structure defined and carefully designed on sensor, then we proposed the wireless communication protocol including transmission and data format applicable in the greenhouse. Experiments showed sleep-wake mode increased lifetime of sensors quite efficiently. The introduction of WSN has remarkable meaning in the design of greenhouse surveillance systems, as it could not only simplify the design of communication circuitry so as to reduce the period of the whole system implementation; but also extend the function and performance of interfaces, then facilitate the maintenance and update of the system.