Abstract: In this paper, firstly using the commonly used piecewise continuum technique for the structures, a new continuous parallel model is taken as the computational model for the overall stability analysis of tall building frame-shear wall structures with N-stepped parameters and with floor slab and base soil deformation considered. The stability differentialequations for the model have been derived.Secondly, using the ODE (Ordinary Differential Equation) Solver, which is a general purpose program developed for solving various ODE problems, including eigen-value problems numerically, the critical loads and buckling modes have been obtained.Finally, a Computer program "OSATBS" is developed for engineering design, and some calculation examples are given.