With the rapid development of integrated energy system in China, the evaluation of energy saving effect of integrated energy system after actual operation is becoming more and more important. The energy saving effect and optimal operation of the integrated park type energy system are analyzed. The park integrated energy system includes photovoltaic power generation system, ground source heat pump system, solar air conditioning system, regenerative electric boiler system and solar hot water system and so on. The energy saving benefit calculation model of each subsystem is established, and according to the operation history data of each subsystem, the calculation results of each subsystem are analyzed. The result shows that the main revenue comes from the second and third quarters, during which it should pay attention to the maintenance of photovoltaic modules to ensure the maximum energy saving benefit. The energy saving effect is not significant. It can cooperate with traditional units for cooling in summer. The heating in winter in the park is provided by ground source heat pump system, regenerative electric boiler system and solar energy air conditioning system. Its energy saving benefit is the main source of energy saving income in the park, with remarkable energy saving effect.