Abstract: The structural dynamic simulation of basic harmonic excitation test is carried out by combining the measure data of few test points with the finite element model so that test time and expenses can be saved and structural monitor can be realized expediently and fleetly.In this paper,simulation research is based on the dynamic matrix transform technology,the dynamic response of reduction free-degree in the frequency domain is calculated by matrix transform after Fast Fourier Transform is implemented to the dynamic response time history data of few test points,Inverse Fast Fourier Transform is implemented to the dynamic response data of reduction free-degree,then the dynamic response time history data of the whole free-degree of the finite element model can be obtained by inverse transform of reduction transform matrix.The simulation on an engineering structure in this paper is done and the simulation results coincide with the test results,so the feasibility and effectiveness of the simulation technology of the paper is demonstrated.