Abstract: Bending vibration is an ordinary modal of the cylindrical shell.Based on the theory of sound radiation of oscillating cylinder,the acoustic radiation of finite cylindrical shell was transformed from infinite cylinder by introducing a modifying factor,an approximate analytical method for solving bending vibration and acoustic radiation of cylindrical shell was proposed.Taking a special long power cabin as an example,the characteristic of far filed acoustic pressure was calculated by the proposed method and boundary element method.The results show the two methods agree well.The proposed method has the advantages of convenient and fast,and it is suitable for engineering evaluation.