基于增量Ｗｉｌｓｏｎθ法推导出增量形式的结构动力方程的数值迭代形式，并针对非线性结构的静动力数值分析提出了求解非线性方程的改进增量方法．改进后的增量法，理论简单，程序实现方便，而且能更好地控制每步迭代引入的误差，能模拟整个加荷过程，并成功地应用于土石坝与地基的静动态相互作用研究． Based on incremental Wilsonθ method, the numerical iteration of incremental dynamic structure equation is deduced. An improved incremental method for solving nonlinear equations is proposed for the numerical analysis of nonlinear structures. The improved incremental method has the advantages of simple theory, convenient program implementation, better control of the error introduced in each iteration, simulation of the entire loading process, and successful application in the study of static and dynamic interaction between earth dam and foundation.