The hydraulic characteristics significantly changes if build a spur dike on the river bend. To solve this problem, a 3D numerical model using the RNG k-ε turbulence model coupled with the Volume of Fluid (VOF) model was conducted to predict the flow characteristics around a single spur dike within the 60° corner bend. The modelling considered three kinds of spur dike model length (0.15 m, 0.25 m, and 0.35 m) and analyzed the flow field structure, cross-section velocity distribution, turbulence characteristic parameters and liquid surface characteristics. It is found that water flowing through the river bend without spur dike will wash the concave bank and cause deposition on the convex bank. The spur dike aggravates the inhomogeneity of flow velocity between the concave and convex banks, weakens the scouring on the concave bank and adjusts the horizontal drop of water surface. As the spur dike length increases, the dimension of backflow area increases, then the strength and action range of turbulent kinetic energy and turbulent viscosity also become larger and larger. The maximum turbulent kinetic energy appears in the flow separation area behind the dam, and the maximum turbulent viscosity appears near the vortex center behind the dam.