It is widely known that environment the traditional air conditioning providing is uniformly, so it is not convenient for meet thermal comfort of different occupants. Task-ambient air conditioning (TAC) system can produce a better individual thermal environment because it can implement individualized control for different occupants. Simultaneity, because of the time occupants in ambient area is short, standard of environment in ambient area can debase correspondingly thus can economize a great deal of energy. This paper aims at the difference of thermal environment between task and ambient area, analysis the thermal sensation under different areas and different temperatures by RWI (Relative Warmth Index) and HDR (Heat Deficit Rate) in the room of using task/ambient air conditioning system. Especially aim at the character of the time in ambient area is short, emphasize analyze the temporary comfort in ambient area. From the calculation result of RWI, we can get that the movable state influence on thermal sensation in the ambient area more and greatly, the calculation result of HDR put forward a temperature scope in thermal equilibrium according difference time occupants in ambient area. Integrate the calculation result of RWI and HDR, the writer suggests that the temperature of the ambient area can't over 30°C. So the influence of movable state must be noticed while evaluation the thermal environment of the ambient area and the temperature of the ambient area can't be too high otherwise will lower the whole environmental acceptability.