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In order to solve the fin evaporator frosting and temperature and humidity fluctuation of air supply problems for the air conditioning of satellite fairing in space launching site, the controlling strategy for compressor with the threshold of cold energy was proposed. This strategy calculated the cold energy that air treatment needed practical based on the enthalpy potential between outdoor air and target air firstly. And then the cold energy would be regarded as the upper limit of PID controller for compressor. The appliance of threshold of cold energy not only kept the PID controller in undershooting state, and avoided the problem of temperature and humidity fluctuation caused by the compressors input jump. In addition, it avoided the compressor inputting cold energy overabundance and solved the fin evaporator frosting problem effectively. The experiments show that the improved air conditioning running stably, and its accuracy of temperature and humidity achieved ±0.5 ℃ and ±3% respectively, and meeting design and application requirement.