Abstract: Finite-element modeling of printed circuit board (PCB) often very difficult due to the complexity of its structure, so an equivalent modeling method of PCB based on experimental data for dynamic property analysis is presented. In the method, the equivalent dimension is obtained from main dimension of real PCB structure, the equivalent density is calculated by the principle of mass equality, and the equivalent stiffness formula is derived based on the theory of vibration and finite element method. Additionally, the influences of joint constrain on equivalent stiffness are studied. In the end, an example shows this method is a good way and available in engineering projects.