This research investigated the ventilation performance of traditional turbine ventilator and two modified type ventilators. One of the modified type ventilators is the low-pressure type ventilator, , and the other one is the vortical ventilator. From the experimental results, we can find out when it is rotating, low-pressure type ventilator has one more tunnel to let air exhaust, so the ventilation performance is increasing by 37% compares to the turbine ventilators. On the contrary, when it is not rotating under low wind speed or it is out of order, being created by bigger low-pressure area on leeside let the ventilation performance of low-pressure type ventilation still has 102% of rotating turbine ventilator’s. Another modified ventilator is vortical type ventilator. From the experimental results, the ventilation performance of vortical type ventilator is 66% greater than turbine ventilator’s. It caused by the rotate effect with high rotate speed. When it is not rotating, it still has 66% better ventilation performance than rotating turbine ventilator. Because even ventilator is not rotating, static ventilator still has stable ventilation performance due to the pressure difference between inside and outside.