The commonly used methods for seal packaging of equipment in troops, such as regular artificial dehumidification and establishment of constant temperature and humidity warehouse, have problems of high cost and artificial consumption. In order to overcome the above disadvantages, a temperature and humidity intelligent monitoring system based on 485 bus was presented. Using the technologies of Capa board, RS485 bus, the sensor of temperature and humidity, automation and so on, a temperature and humidity intelligent monitor was designed in the background of the mission for seal packaging of the armored vehicle, and a temperature-humidity intelligent monitoring system was formed, which consisted of the monitor, the rotary dehumidifier and the envelope for armored vehicle. The system could ensure the proper temperature and humidity for the equipment and guarantee the environment humidity at 45%, significantly increasing the level of automation and reducing the cost for seal packaging of the equipment. In conclusion, the temperature and humidity for the equipment could be automatically controlled by the system, and the system has been used in several armored troops with good performance.