Abstract: The authors had researched the heat accumulation capacity of solar energy system and the heating capacity of the solar-ground source heat pump system. The solar-ground source heat pump system was built for 220 square meters of the building. Considering winter heating load as building energy demand,we built the solar-ground source heat pump system. The experimental results suggest that,the soil temperature has been raised 3 ℃,and the heating capacity of heating system has been improved by8%,it is feasible to use this system in heating seasons.