The coupling of mathematical equations was substituted by coupling of physical process

and the basic governing equations of fluid domain

solid domain and fluid-solid interface were deduced respectively for flow-blade interaction system.Furthermore

the numerical method was given through bidirectional sequential method

and the corresponding physical process of blade vibration from unsteady to steady state was described.Finally

certain engineering sample was discussed to verify the method

and the dynamical responses of certain secondary stator used in a missile engine were obtained.Thus the characteristics of flow field and stress distribution on stator were gained

and the advantages of sequential method on solving fluid-solid interaction(FSI) problems were pointed.