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Based on wireless sensor networks, a greenhouse environment monitoring system was designed to deal with problems in current greenhouse monitoring system, such as complicated cabling, high energy consumption, limited transmission distance, and inflexible deployment. With SoC of CC2430 and ZigBee protocol, environment information was collected, self-organized networks were realized and aggregated monitoring data was collected by the wireless sensor node. Gateway hardware platform was structured based on the S3C2410A microprocessor, and WinCE5.0 operating system was chosen as software platform. A gateway management system was developed on embedded database for sensor node administration, data processing, and early warning of weather disaster. Preliminary experimentations showed that the system met the application requirements of greenhouse monitoring system excellently, and had the advantages of low power consumption, inexpensiveness, flexibility, extensibility, and friendly human-machine interface.