Abstract: A novel PV/T roof is presented,which has the basic function such as waterproof,beautiful,and for evaporator of PV/T heat pump system,successfully integrating power generation and heating. In this work,temperature distribution of the PV/T roof and air flow characteristic in the cavity in summer were comprehensively analyzed by experiments,and the effects of the PV/T roof on external surface temperature of the original roof and building energy consumption were elaborated. The results showed that the fluid in the cavity of PV/T roof system is heated as the heat pump system operating in summer. In contrast to the ordinary roof,the external surface temperature of the original roof in PV/T system is reduced around 21 ℃ at the highest in the daytime,while slightly higher than the ordinary roof 1 ℃ at night. In general,the set of PV/T roof reduces the building heat gains by 44%.