To resolve the problems that the auto control parameters can not be modified according to the staggered demand or the manual control mode can not be remotely switched during the greenhouse environmental control process, a greenhouse environmental control system was developed based on embedded Web server. The system was divided into three levels: the local greenhouse measurement and control layer, the embedded Web server layer and the user adaptation layer. In the local greenhouse measurement and control layer, a wireless sensor network was used to collect air temperature, humidity, light and carbon dioxide. And a real-time video monitoring system was installed to enrich the information of local greenhouse. In the server layer, the embedded BOA server guaranteed the communication between the hardware and users. In the user adaptation layer, the administrator could directly check the greenhouse environment and control equipment manually through dynamic HTML page or the Android application. Besides, users could remotely access the webcam in greenhouse so that they could observe running status of the equipment and growth status of the crop in the greenhouse. To verify the reliability and practicability of the system, the greenhouse environmental control experiments were conducted. The process of greenhouse environmental control was simulated for cucumber during northern winter. Taking the temperature as main parameter and the humidity and the light as auxiliary parameters, the data collected from the trials showed that the process of auto measurement and control took 5s at least, and the process of manual measurement and control took 3s at least. It indicated that the system was reliable and stable for greenhouse environment monitoring and controlling.