Abstract: A PV/T-coupled medium-deep GSHP system（PV/T-GSHP） was established based on TRNSYS to address the ground temperature attenuation issue in the medium-deep geothermal heat pump system（GSHP）. The research object was a civil energy-saving building in Handan City. The operating characteristics of the 20-year PV/T-GSHP system were simulated and analyzed, and the influence of relevant parameters of the PV/T components on the average soil temperature was investigated. The energy consumption of the PV/T-GSHP system was compared with other systems. According to the research, the PV/T-GSHP system′s unit COP rose from 6.44 to 6.81 when compared to the GSHP system, but the system COP was reduced to 2.38 due to the increased pump power. However, considering the electricity generation, an average annual income of 10 015.83 yuan can be obtained. The proportion of PV/T components on the roof of similar structured buildings affects the heat pump flow rate and the average soil temperature rise. When not considering electricity generation, the energy consumption of the PV/T-GSHP system was 8.46% higher than that of the gas boiler system. Compared with the coal-fired boiler and electric boiler systems, the energy consumption can be reduced by 11.04% and 48.55%, respectively.Taking into account the electricity generation, the actual income from electricity generation in 20 years is equivalent to 210.05 tons of coal.