A number of important factors that impact the construction of underground water source heat pump were analyzed in this paper. By using the AHP method, suitability evaluation index system of the using underground water source heat pumps in China has been established. According to the analysis and compare of the results, the evaluation index system has been established, which shows the suitability evaluation index system is reasonable and the evaluation result is credible. The result can provide a basis to design water-source heat pump. Also it can provide references to orderly use the water-source heat pump for the local conditions.