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Dynamic modeling and theoretical analysis are important for the optimal design of eccentric-mass type of forest fruit harvest machine. Based on the principle of eccentric-mass type of forest fruit harvest machine, a simple three-element dynamic model of the harvest machine-fruit tree system was constructed by equivalent mass, spring and damping. The vibration differential equations were established with the simplified model method. By means of analyzing motion process of the vibration system, expressions of displacement, velocity, acceleration, amplitude, phase difference were derived, and inertia force of forest fruit, fruit removal condition and power consumption of the harvest machine were analyzed. The dynamic model showed that steady-state responses of displacement, velocity, and acceleration of the vibration system were periodical motion. Fruit removal rate was main relationship with response amplitude of fruit tree and excitation frequency of forest fruit harvest machine. Vibration amplitude of fruit tree was not only affected by the characteristics of the system itself, such as natural frequency and damping ratio etc., but also related to the excitation frequency. So the multiple effects of the factors resulted in vibration amplitude of fruit tree. Power consumption of the system was proportional to amplitude and the cube of frequency. The conclusion was that excitation frequency was a key working parameter of the harvest machine. In order to get the best effective harvest of fruit, selecting fitting frequency for a special fruit tree was a key step in the limited power of the harvest machine.