Abstract: Poultry housing enviromental factors, such as temperature, humidity .poisonous gases and air velocity, are affected by ventilation technology to a great extent. Compared with the Cross Ventilating house,enviroment of Tunnel Ventilating house has been improved a lot: air velocity increased, about 6 times and air movement distributed more uniformly. The level of amonia and the mumber of micro-organisms decrease 50 percent and 68 percent respectively. Dust also reduces from 34. 6mg/m³ to 11. 4mg/m³ and 23. 7 percent of power has been saved.