Abstract: The temperature and humidity monitoring system based on radio data communication is designed to resolve the problem that operating condition in outdoor terminal box can't be obtained in time and conveniently.The system has two components: the temperature and humidity monitoring module installed in the terminal box and the remote monitor background.The data will be stored, displayed and analyzed in the remote monitor background.The site hardware and background software are integrated effectively, which helps the operation and maintenance staff obtain the data of operating condition in outdoor terminal box in time. The timing character of the operation and maintenance work is promoted under the human resources shortage background.