Abstract: To give helpful guidance in designing of number of bolt and magnitude of pre-tension force by numerical analysis on spherical-cylindrical shell structure connected by bolts subjected to impact loadings.The dynamic relaxation method is adopted to calculate initial displacement and initial stress of spherical-cylinderical shell structure.The dynamical response of the structure subjected to the impact loadings is then given.The contact movement between the spherical shell and cylinderical shell,being in pre-traction state,is described through historty of contact forces on flanges.The relative movement between them turned out the changes of pre-traction in the bolts.The history of strain at the given test points revealed the stress wave propagation whereas the contact forces on the projectile-target surface and flange surface are correlated.It is proved that the numerical method is reasonable on analyzing impacting behavior of spherical-cylindrical shell structure connected by bolts.