Abstract: To overcome the technical challenges hindering the development of shallow geothermal energy in building clusters and promote the further application of ground source heat pump（GSHP） systems, a fully coupled model of vertical ground heat exchanger, heat pump unit, and building load was established using COMSOL software.Subsequently, parameters affecting the operational performance from the ground-side, equipment-side, and buildingside were parametrically modeled. By employing combined simulations with COMSOL and MATLAB, the model’s accuracy was validated, and the results demonstrated the reliability and accuracy of the assessment method, with an overall fitting accuracy of over 95% for all parameters.