This paper describes the design of the screen monitoring software ideas and development techniques. With the WinSock API interface and MFC Internet programming technology, the system uses C/S model, based on UDP protocol for communication. The client side (Client) sends commands to crawl the screen Control through the Winsock. The server side (Server) receive capture screen instructions from server-side, and translate them into JPEG data streams, the server-side image data stream. Experimental results show that the method can easily realize the computer screen monitoring.