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Aircraft High/Low Temperature Environmental Simulation System is mainly used for the test of the giant spacial deploying antenna and the functional deploying test of some large-scale structures at extreme high/low temperatures, and some other relevant tests. This project requests controlling the parameters of the system in a large range with high accuracy and no overshoot. The air condition is nonlinear and time-varying.And between parameters, there is a complicated coupling. In view of these difficulties, this paper wants to design a distributed measurement and control system, which proposed the improved intelligent PID control method. By establishing the PID gains database offline, the system based on fuzzy logic, can choose a optimized PID initial gains according to all the setting values. This system has a good self-adaptability. In practical application the system has met the specifications requirements well, and also achieved excellent controlling effect at the same time, which is of significance to the similar complex system.