Abstract: With the feeding density increasing gradually, ventilation technology plays a more important role in farm house enviroment control. Ventilation technology at home and abroad are summarized and analysed. Positive Pressure Ventilating System can well contact with temperature regulating equipments, but the capital investment and management cost are higher than other systerms. Low air velocity and poor uniformity of air movement are found in Cross Negative Pressure Ventilating System. However, the case in Tunnel Negative Pressure Ventilating System is opposite to those in Cross NPVS, but it has some limitations in winter.