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The system design using STC89C52 single-chip microcomputer control, based on GSM communication, mobile phone short message way, realized the remote monitoring and control of indoor temperature and humidity. Monitored space once temperature or humidity exceeds the threshold, the GSM module send text messages to mobile phone to display temperature and humidity data, the administrator can work through the SMS remote control relay, and then start the related equipment heating, cooling, humidification, dehumidification, etc. Through experimental test, the system realized the remote monitoring and control of indoor temperature and humidity. System has a high accuracy, small size, stable performance, convenient and flexible, in smart home, crop management, warehousing, and other fields have a wide range of applications.