Ground temperature and systematic parameters of running groundsource heatpump system were collected from a laboratory in Tongji University, and the change laws of the parameters were analyzed to evaluate its effect on the system. The following conclusion can be drawn: the ground temperature rises 0.64 ℃ in 44 d, the range of temperature variation decreases with depths, and the temperature will be a relative constant when depth is deeper than 120 m. The ground temperature recovery rate is 0.14 ℃?100 d-1, and with the increasing of soil temperature, the temperature gap of inlet and outlet water will decrease 0.87 ℃ and the system performance rate and heat transfer efficiency will decline.