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.%PCB板因内部结构复杂而有限元建模困难或无法进行建模，为此提出了基于实验数据的PCB板动态性能等效建模方法。该方法利用原PCB板的外观主尺寸构建等效几何模型，利用质量相等原则获得等效密度，并通过有限元理论和振动理论推导了等效模型的等效刚度求解公式。在此基础上，分析了约束方式对等效刚度的影响。等效实例分析结果证明该等效方法是切实可行的。
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