Abstract: A wind tunnel test is carried out on an 1 000 MW class low-angle hyperbolic concrete cooling tower,and the pressure test is carried out on a scale model of 1∶500 when ventilation rates of the radiators is 0,0.2,0.4,0.6 and 0.8 respectively.The relationship between the internal wind pressure and the opening of radiator shutter and the wind speed inside the low-angle intercooling tower is studied,and the value change of the average pressure coefficient of the upper surface,lower surface and joint pressure of the broadening platform seal plate under different working conditions is also studied. Through test and analysis,the average wind pressure coefficient of internal pressure and the shape coefficient of the broadening platform seal plate are calculated,which is used in the design and calculation of low-angle intercooling tower.