Quantitatively assessing the effects of ridge cultivation methods on slope soil erosion can provide important theoretical guidance for prevention slope erosion. Based on the long-term field monitoring data of runoff plot in Harbin city from 2012 to 2015, the effect of longitudinal ridge, contour ridge and flat tillage on runoff and sediment were discussed. The relationships between runoff and sediment under different ridge tillage were analyzed. The results showed that there were significant differences in runoff and sediment yield between different ridge tillage methods, showed the orders of runoff and soil loss was of flat tillage > longitudinal ridge tillage > contour ridge tillage. Compared with flat tillage, contour ridge tillage reduced the runoff and sediment yield by 92.4% and 98.3%, and longitudinal ridge tillage reduced the runoff and sediment yield by 66.4% and 72.2%. When the slope gradient increased from 3° to 5°, the soil loss increased by 0.8, 8.2, and 5.5 times, respectively under flat tillage, longitudinal ridge tillage and contour ridge tillage. The result also showed the significant correlations between runoff and sediment under three tillage methods. The increasing range of soil loss under longitudinal ridge tillage and flat tillage treatment was much larger than that under the contour ridge tillage slope. When the slope runoff was greater than 10.0 mm, soil loss under borth treatments of longitudinal ridge tillage and flat tillage increased sharply.