Abstract: The principles of the generation process of noise from the large cement old moded mechanical ventilating cooling tower are analyzed in the paper.Based on noise and distribution about dwellings on the spot,the general noise control technique such as noise elimination.Sound insulation sound absorption are used to make great use of the principle of sound decay.The noise has been reduced a lot Environment noise around dwellings meets the national standards of environment noise control.Thus environmental and social benefits are obtained.