Taking the Suzhou Industrial Park as an example,this paper introduces the projects composition and construction ofthe optimizing energy system with multi.complementary integration.The overall structure and control structure of the system are ana.lyzed. The modeling and simulation of CCHP, virtual grid optimiza.tion scheduling, distributed energy system collaborative optimizationand other key technologies are studied. The conclusion is that multi.energy complementary energy system has a broad application pros.pects in energy.saving emission reduction, economic development and so.