With growing attention to energy conservation and emission reduction, solar energy is used in various fields as the basic renewable energy source and the maximum amount of energy that can be exploited in the world today is used in various fields. Therefore, a composite type combined heating operation mode based on solar collector, ground source heat pump and heat storage electric boiler in the integration is proposed, which solves the problems of traditional heating environment problems and shortcomings to a certain extent. In order to meet the load demand of the heating terminal and improve the economy of the whole heating system, combination of equipment capacity is optimized according to the existing load demand and the working characteristics of the related equipment. In this paper, the principle of the combined heating method is analyzed, and then the mathematical model and the relevant constraint conditions are set up for each component of the heating system such as solar collector, ground source heat pump and heat storage electric boiler, with the number of different components as variables, including energy, environment and economic evaluation of three indicators of a comprehensive the cost of the minimum target index. Finally, genetic algorithm is used to obtain the optimal capacity of each component in the system. The effectiveness of the proposed model is verified by a numerical example.