Abstract:The central air conditioning has been widely used in enterprises in the current, it put forward higher requirement about talent. In order to meet the training needs, we need to develop the simulation and training system. Central air conditioning training system has been completed according to Prototype of central air conditioning. Refrigeration system, including the core components of the compressor, evaporator, condenser, throttling valve are modeled and simulated.. The system has been developed in C++ language binding COM components technology,it can simulate air conditioning units to checking, start-stop running, operation and tuning, troubleshooting, and other functions. The system runs with stable and reliable and has a certain practical and promotional value.