Abstract: In order to solve the problem that the electrical efficiency of photovoltaic cells decreases with the increase of temperature,and the soil heat imbalance caused by ground source heat pump system heating,the operation performance of the solar photovoltaic/thermal-ground source heat pump（PV/T-GSHP）hybrid heating system is investigated using TRNSYS software. A typical residential building model is used,and the soil temperature,seasonal coefficient of performance for heat pump units（SCOPHP）,photovoltaic electrical efficiency and solar fraction are taken as the evaluation indexes. It is found that:the solar fraction is relatively high in hot summer and cold winter region（take Changsha as a case）,the soil temperature at the end of 20thyears is only 0.8 ℃ higher than the initial ground temperature,the SCOPHPis about 5.1 and the solar fraction is 97.0%-98.7%,when the PV/T modules are installed on full of the roof（900 m2）;The solar fraction in different climate regions is related to the area of PV/T modules and the cumulative heat load of building. By defining the index,PV/T module area per accumulated heat load of building,the coupling relationship between the solar fraction and the defined index in different climate regions of China is obtained. In the regression equation,the coefficient of determination,R2,is 0.983. The area of PV/T modules required can be calculated from the regression equation when the building cumulative heat load and solar fraction are known. The annual primary energy consumption of PV/T-GSHP hybrid heating system is significantly less than that of flat panel solar collector and ground source heat pump hybrid heating system（the minimum decrease is in Shenyang,49.7%）,much less than that of air source heat pump system（the minimum decrease is in Shijiazhuang,79.8%）and gas wall mounted furnace system（the minimum decrease is in Shenyang,65.1%）,respectively.