In order to investigate the influence of different factors on heat transfer law around the Vertical U-Tube ground boreholes' group, three-dimensional physical and mathematical models of unsteady heat transfer were established for the soil around the vertical U-tube ground boreholes' group. The heat storage was studied on the basis of experimental verification and single U, a year was taken as the time domain, the effects of the arrangement of the underground pipe, rate of the heat storage and release and soil type on the soil temperature distribution of the Vertical U-Tube ground boreholes' group were analyzed. The results indicate that the arrangement of the underground pipes has little influence on the soil temperature around the buried pipe group when the distance of drilling is constant; The overlay area of soil temperature between drillings increases with the increase of soil thermal diffusivity when operation time is constant; The fluctuation range of soil temperature decrease with the increase of soil thermal conductivity; Heat imbalance of soil becomes serious with the decrease of the heat storage and release rate; For the region of larger heating load, it should appropriately improve rate of the heat storage and release. The soil temperature predicted by the model are in good agreement with the corresponding experimental data, and the maximum relative errors are 14.2%.