In order to deal with the too long time of building model and calculation in the field of thin- walled structures, this article introduces single- dimension- finite- element to programming. So the number of elements and DOF(degree of freedom) is reduced largely, and those geometric parameters of thin- walled structures can be gotten conveniently, which makes it easier for further analyses of bend, torsion, transient response. The numerical example indicates: results gotten by this program are consistent to those gotten by NASTRAN, but time- consume is remarkably shortened, which can be applied to judge dynamic displacements during a initial structure design by designers without FEM(finite element method) software, and increases efficiency greatly. 