Abstract: With increasingly serious environmental problems, improving the energy utilization and reducing the emission of pollution has become an important direction for smart grid. The distributed Combined Cooling Heating and Power (CCHP) system becomes a promising distributed generator (DG) with its high energy efficiency. In this paper, firstly the traditional CCHP structure is optimized by heat storage system and power driven heat pump/electric refrigerator, in which the fixed relationship between power supply and heating is broken. Secondly, this paper analyses the characteristics of the flexible load (FL), and proposes different control methods for different load types. Considering the advantages of grid power supply, DG and demand response collaboration, this paper puts forward a multiple energy complementary strategy considering CCHP and flexible load. The method considers many indicators including the economic indicator, the environmental indicator, the energy efficiency indicator and the interests of users. Further, this paper transforms the multi-objective optimization problem into an integrated single objective problem by analytic hierarchy process. Particle swarm optimization (PSO) algorithm is used in this strategy and the fitness function is constructed by penalty function method and solved by PSO.