This paper analyzes a vibration problem occurs in multi-way valve throttle load experiment. The dynamic process of the vibration in throttle valve is first analyzed to find out the key parameters relating to the vibration. Then an AMESim model of the hydraulic system with the vibrating throttle valve has been built. Detailed research on how these parameters influence the vibration is done based on the model. Some conclusions on the relationship between design parameters and the vibration are achieved.