Abstract: This paper discusses the problem of determining dynamic loading history by using the method of inverse analysis in vibration. On the basis of the solution for dynamic equilibrium equation utilizing the Newmark method, formulas for calculating vibration loading were derived. The reliable loading coefficients were estimated by using the method of least squares. A finite element method for calculating vibration-loading history was put forward by using the measured structure responses under dynamic loading. Examples are given to verify its effectiveness. This paper provides a new method for estimating vibrating loading.