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The economical analysis of heating/cooling sources for ecological building using renewable energy was mainly discussed. Firstly, the application patterns of natural resources which used in heating and air conditioning system for ecological buildings were generalized, then the famous AHP method was introduced into the decision-making process of scheme selection of heating/cooling sources for an ecological residential district, while the economic evaluation indexes which related to energy conservation and environmental protection were adopted to compare and analyze the economic technology. At last, a computer program that based on AHP method was established to simplify the process of calculation and improve the work efficiency. Based on saving energy and environment protection, it is shown that using of renewable energy in the ecological buildings can get visible economic efficiency, energy-saving efficiency and environmental efficiency.