The air velocity field of different ventilation modes is simulated by FLUENT software, and they are shown in figure 2-5, which indicate the simulation results of room 1.5m. From these figures, when the natural ventilation is operated, the air distribution of rooms except bathrooms and kitchens is relatively uniform. However, its comprehensive effect is not stable, due to the limitation of opening time and area of windows, the outdoor meteorological environment. When the natural inlet and mechanical exhaust is operated, the air distribution of rooms is relatively uniform, and the temperature distribution is also relatively reasonable. When the wall type ventilator with heat exchange is operated, the air distribution of rooms is not reasonable. The fresh air is concentrated in the area near the vents, and they have a little influence on the air inside the room. When the ventilation unit with heat exchange is operated, the air distribution of rooms is relatively reasonable. 2016