本文用有限元线法对变截面的高层简体结构进行空间整体稳定和二阶分析。先把实际框筒结构分段连续化为正交各向异性折板结构；用有限元线法，通过有限条元半离散化，取结线上位移为基本未知函数，由势能驻值原理建立稳定和二阶分析的常微分方程组；由常微分方程求解器直接求解。 In this paper, the spatial general stability and second-order analysis of high-level simplified structures with variable cross-sections are performed by the finite element method. First, the actual frame structure is segmented into an orthotropic folding plate structure. Using the finite element line method, the semi-discretization of finite elements is adopted, and the displacement on the line is taken as a basic unknown function, which is established by the principle of potential energy resident value. Ordinary differential equations for stable and second-order analysis; solved directly by the ordinary differential equation solver.