In order to reveal the effects of freezing and thawing on soil water erosion, and to study the temporal and spatial evolution processes of hydrodynamic erosion parameters on freeze-thaw slopes during the spring thaw period, two slopes (10° and 15°), four flow rates (4.5 L/min, 6.5 L/min, 8.5 L/min, and 10.5 L/min), and four original thaw depths (2 cm, 5 cm, 10 cm, and 15 cm) had been taken into consideration in this experiment under the circumstances of scouring slopes in the field. Hydrodynamic erosion parameters (the Reynolds number, Froude number, flow velocity, flow shear stress, stream power, and unit stream power) were systematically analyzed under the conditions of different original thaw depths, flow rate and slopes. The results showed that hydrodynamic erosion parameters, including the Reynolds number, flow velocity, flow shear stress, and stream power, were increased with the increasing flow rate. The flow shear stress, stream power, and unit stream power increased with the increasing of gradient. The flow shear stress and stream power were increased with the deepening of original thaw depth. The Reynolds number, Froude number, flow velocity, and the unit stream power changed less obviously with the original thaw depth. However, when the original thaw depth was 5cm, hydrodynamic erosion parameters changed the most dramatically with time. The power function prediction equation was established, including the Reynolds number (R2=0.728), the flow shear stress (R2=0.644), the stream power (R2=0.721), flow velocity (R2=0.533), and the unit stream power (R2=0.553).