In this paper, it uses a manikin to test effect of wind velocity on the surface of clothing thermal resistance, and concludes that with the increase of wind velocity, the heat resistance of the clothing decrease rapidly. A seven-point thermal sensation scale was used to evaluate thermal sensation in Tianjin area, the result shows that the neutral temperature is 27.2 °C when the wind velocity is 0.82 m/s . Above 3.2°C is higher than the current specification recommended indoor temperature 24°C. It shows an appropriate increase indoor air velocity can improve the building comfortable temperature. Saving energy 29.7％一41.6％.So provides an effective way reducing the energy consumption of the air conditioning system.