In order to reveal the mechanism of soil erosion process of engineering accumulation during spring thawing period, the accumulation of excavated river engineering in western Liaoning Province was taken as the research object, the erosion process of cinnamon soil engineering accumulation slope during spring thawing period was studied by indoor simulated water discharge scouring test. The results showed that:The runoff of each thawed slope increased with the increase of discharge scouring amount, and under the same discharge scouring amount, the runoff trend was unfreezing slope>thawed 2 h slope>thawed 4 h slope>control; the longer the thawing time, the more obvious the delay effect of slope on runoff and the more serious the slope erosion; under the same discharge scouring amount, the trend of the total sediment yield on the slope surface of the accumulation body was thawed 4 h slope>thawed 2 h slope>unfreezing slope>control. Compared with the control, the average sediment yield of slope affected by freezing and thawing increased by 7.90%~44.76%, respectively. Under different thawing time and water discharge conditions, the runoff, sediment yield, and water discharge of engineering accumulation slope linearly changed. With the increase of discharge scouring amount, runoff and sediment yield linearly increased. Compared with natural soil, engineering accumulation is more prone to soil erosion.