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The structural circumferential periodicity of inertial excitation produced by concentrated mass was utilized to establish the mathematical model of thin circular plate carrying eccentric concentrated mass and to analyze its trans-verse vibration. The fundamental frequency coefficient, natural frequency and mode shape function are determined by this method. A clamped thin circular plate was taken as an example to study the mass effect on the vibrating system. Comparison between the present results and published ones exhibits excellent agreement, which shows that the ana-lytical method in this paper can be used to predict the transverse vibration parameters accurately.