In order to improve the energy efficiency of ground-source heat pump system and reduce the system underground heat exchanger area and to lower the system investment, different technical solutions are considered in ground-source heat pump system of Shennong Hotel. After comprehensively analyzing and comparing the system heat load, the annual unbalance heat load , cooling water flow and the system energy efficiency of different solutions, the scheme of cooling and heating integrative machine with water heater series connection and cooling tower auxiliary radiation hybrid system outperforms the other schemes. However, the scheme is subject to the unequal cross-sectional area between the condenser of cooling and heating machine and the evaporator of water heater, resulting in flow resistance increases and affecting the use effect. Therefore, the key issue for researchers and manufacturers is to develop the matching condenser and evaporator with equal circulating water flow area.