PV/T solar-assisted heat pump system (PV/T-SAHP) was presented in this paper and model of the PV/T-SAHP system was made up in this study. Simulation result showed that the electrical efficiency and the thermal performance of PV/T-SAHP is better than the traditional heat pump water heater system or the traditional photovoltaic system. It is proposed that the area of PV/T module,the tilt angel of PV/T module and the distance of refrigerant pipes are the three key factors of the PV/T-SAHP system optimization design.