Abstract: The rigid pressure-testing model of a three centered cylindrical latticed shell is tested in a wind tunnel. The net wind pressure distribution and the effect of internal wind pressure on net pressure on the structure are discussed. The results shows that the highest negative net wind pressure appears nearby the top of the structure and the negative wind pressure decreases because of negative internal wind pressure on the whole structure at the moment when wind perpendicular to the structure longitudinal axis; at same time positive net pressure which appears at windward end increases due to a negative internal wind pressure. Beside the high wind pressure at windward end, the mean net wind pressure and fluctuating net wind pressure are quiet low, and the effect of internal wind pressure is not significant at the case of wind parallel to the structure longitudinal axis. The positive internal wind pressure area appears at other cases which induce high negative net wind pressure.