Abstract: The environmental parameter monitoring provides a good feed-back about the efficient working process for the ground test equipment of manned spacecraft. An environmental parameter measuring system based on micro controller unit (MCU) is put forward to improve the system automatic detection ability and test-point setting flexibility. The system enjoys the advantages of small size and sensor-configurable, with 8 channels of temperature, humidity, fog concentration measurements. Users could arrange the test-points and set thresholds for their own. Measuring data and the alarm information is public to users both through the software display and the GSM messages. The system application can realize the parameter trend detection, to determine the real working environment state of the ground testing equipment, and provide an efficient feed-back for the environment control.