Abstract: To improve the operating efficiency of the heat pump heating systems,this paper proposed a forced convection-based radiator as the indoor terminal of heat pump. On the basis of actual measurements,this paper used CFD to simulate the indoor thermal environment created by forced convection radiators in a typical office. With the goal of maximizing the energy saving potential,the air supply velocity and the surface temperature of the radiator were optimized simultaneously considering thermal comfort constraints. The study indicates that the effect of air supply velocity and surface temperature on the indoor thermal environment were coupled. To effectively avoid the human body wind feeling caused by forced air supply,installing a baffle at the air outlet of the radiator was recommended. The optimized radiator surface temperature is 41-45 ℃ with the air supply velocity in the range of 1.2-1.9 m/s,indicating that the proposed technology can lead to significant energy benefits.