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User Defined Functions (UDF) with three major macro programming was used to update the centroid position and vibration state of the pier, a numerical model of vortex induced vibration of the pier was established and combined with nested grid technology to analyze the hydrodynamic characteristics of the pier with and without pre partition plates. The results show that after setting up the front partition, the downstream length and vortex length of the backflow zone of the pier significantly decrease with the increase of the reduced velocity when the reduced velocity is 6-7, while the pier without a pre baffle shows the opposite trend. The pre baffle effectively suppresses the wake disturbance. When the reduced speed is between 7 and 9, the length of the downstream and vortex in the recirculation zone of the pier with a front baffle is smaller than that of the pier without a front baffle. The front baffle reduces the impact of vortex induced vibration on the pier. The front partition effectively delays the vortex shedding time, and the pressure distribution on the upper and lower surfaces of the pier is more uniform, weakening the vortex induced vibration response of the pier. [ABSTRACT FROM AUTHOR]