Abstract: In order to obtain higher temperature difference and heat transfer efficiency,and improve the comprehensive performance of the system,a new SAGSHP system is proposed in this paper,in which the buried pipes are divided into groups in series and parallel.TRNSYS-18 is used to simulate and study the system operation mode,soil temperature field,the inlet and outlet temperature of ground source heat pump,and the average temperature of the storage tank under the conditions of different series-parallel zoning area and different heat storage capacity. Meanwhile,the accuracy of the model is verified by an experiment which used the subarea series-parallel of the underground pipe groups. The performance of the new system is compared with that of the traditional SAGSHP system under the same scale. The results show that the system has the best comprehensive performance when the area ratio of series to parallel is 1∶4 and the heat storage capacity is 3∶2. Under the design parameters,the SCOP of the system can reach 5.2,which is 13.0% higher than that of the parallel traditional system,18.1% higher than that of the traditional series system. Moreover,the new subarea series-parallel SAGSHP system can run steadily and meet the end heating demand.