Abstract: In order to solve the problem of soil temperature decreasing year by year in the application of ground source heat pump system in China Northwest villages and towns,a solar assisted system is added,and the control strategy of the solar-ground source heat pump system（SGSHP）is setup,and the applicable areas of SGSHP are analyzed.Taking a primary school as the measurement object,literature research and digital simulation are used to propose and simulate operation strategy.The results show that SGSHP is suitable for agricultural facilities and schools.The optimal control strategy is that solar energy heats soil in non-heating seasons and solar heating is preferred in heating seasons.The optimized area of solar collector is 86 m~2,and the volume of water tank is 3.9 m~3.The sectional area of heat exchanger is 0.4 m~2,and the flow of circulating pump is 6.6 m~3/h.The heat exchange tube is 120 m long,and the soil temperature can be restored in a natural year.