Abstract: Greenhouse environment is the precondition for crop's growing. In our country it is controlled artificially based on experiences. So the quality of agricultural products is decreased. Thus detecting and controlling to greenhouse environment automatically is an important problem to solve urgently. This paper establishes automatic detection system for greenhouse environment. The system takes advantage of realtime processing methods under the direction of expert system. It can also offer technological guidance and technical consultation service to the users in time and establishes a good exchange relation between persons and the computer.