To　reduce　the　vibration　and　noise　of　thin　shell　structure　in　rotary　machine,　the　damping　layer　and　constraint　layer　are　pasted　on　the　surface　of　thin　shell,　and　their　thickness　is　searched　for　in　many　different　designs.　Selecting　a　large　number　of　designs　in　the　design　space,　determining　representative　points　which　can　reflect　the　structural　vibration　characteristic　in　the　thin　shell　structure,　all　the　designs　are　analyzed　with　random　response　method　in　the　range　of　effective　frequency　to　obtain　the　maximal　normal　acceleration　of　all　representative　points　in　different　design.　To　reflect　the　effect　of　structural　vibration　reduction　in　the　round,　the　K-S　function　is　adopted　to　process　the　maximal　normal　acceleration　of　all　representative　points　as　a　synthetical　parameter　which　can　reflect　the　vibration　characteristic　of　the　whole　structure.　With　vibration　level　difference　of　the　modified　design　to　the　initial　design　as　the　evaluation　parameter　for　effect　of　reducing　vibration,　good　or　bad　of　the　modified　design　is　evaluated.　Results　show　that　the　vibration　and　noise　of　thin　shell　structure　can　be　effectively　reduced　with　the　damping　layer　and　constraint　layer　pasted　on　the　surface　of　the　thin　shell　structure,　and　that　the　vibration　characteristic　of　the　whole　structure　can　be　commendably　reflected　with　the　K-S　function　and　vibration　level　difference　processing　the　data　of　dynamical　analysis.