Abstract: The temperature, humidity and cleanness of the spacecraft AIT workshop affect directly the life and the reliability of the space products. The influencing factors include: the airtightness, air conditioning system, variation of weather conditions，and the frequency of people and devices passing in and out How to effectively control and measure the variations of conditions is the key to avoid environment parameters going out of range, which needs a system with highly reliable environment data. This paper discusses how to build a real time environment data system with multi-point, automatic inspection and display.