To study the influence of the pick angle and length of spur dike on the flow characteristics of recirculation zone behind the spur dike, the computational fluid dynamics (CFD) method was applied to simulate the flow fields and the distributions of turbulent kinetic energy and turbulent viscosity under three pick angles (60 °, 90 ° and 120 °) and three projection lengths (0.12 m, 0.2 m and 0.3 m) of spur dike. The results show that the maximum relative length L/B and width W/B of recirculation region are positively correlated with the relative projection length of spur dike b1/B. The turbulent kinetic energy diffuses and attenuates along the flow separation zone to both sides and downstream, and the maximum value is located at the flow separation zone behind the spur dike. The projective length and angle directly affect the size and distribution range of turbulent kinetic energy and turbulence viscosity. With the increase of water depth, the distribution patterns of turbulent kinetic energy and turbulent viscosity remain the same, and the values decrease slightly with the increase of water depth.