Abstract: Water flows pass through the bridge piers and form a complex three-dimensional flow field in the pier area， which has great impacts on scouring at the bottom of the pier and on navigation in the bridge area； therefore， it is very important to control the flow regime in the turbulent region of the piers. The RNG κ-ε turbulente model is adopted for three-dimensional numerical simulation of flow around the pier. The values of intensity of turbulence around the pier are calculated and analyzed when the diversion vanes of different lengths are set at the end of the pier. After the diversion vane is placed， the maximum turbulence intensity at the X/D=0~5.3 cross-sections around the pier decreases significantly， and the turbulence intensity behind the pier generally reflects a decreasing trend. Besides， the diversion vanes of different lengths have different control effects on the current around the same pier. And the diversion vane of the appropriate length can narrow the range of the turbulence intensity of σ＞0.1， which means the reduction of the width of the turbulent flow.