In order to explore the influence law of dynamic processing parameters of polymers on the power consumption, the response of electromotor power consumption of a self-designed coaxial-barrel dynamic rheometer （CBDR） to the vibration force field was analyzed based on the melt conveying model, and a theoretical model describing the power difference between the dynamic output and the steady output was established. Then, the electromotor power consumption of the CBDR was measured and was compared with the theoretical one. It is found that the proposed theoretical model is effective in predicting the change of practical electromotor power consumption with vibration parameters. The experimental and theoretical results indicate that the power consumption decreases with the increase in vibration frequency and amplitude. Moreover, the feasibility of the proposed model is verified by the actual change of energy consumption of vibration injection machine.