Abstract：In order to obtain a more accurate boundary condition of structure in dynamic analysis and optimization design, the parameter identification of joint as one of the key technologs. In combination with engineering practice, proposed the method of frequency response function (FRF) to identify the characteristic parameters of the joint. Whether it can obtain complete FRF is studied and propose the corresponding solution strategy in this paper. This method avoids the matrix inversion directly, and transforms contradictory equation to definite solution of equation with least-square principle, which ensures the stability of numerical calculation. Considering the damping information is inferior to stiffness information in identification process, in order to identify the damping more accurately, using the second identification method to identify damping parametres. This method has a certain practical value and the identification process is simple. Example analysis confirmed that this method has high identification accuracy.