Abstract: Commercial forest logging destroys the original forest ecology, reduces the fiction of the root system and the ability of soil moisture cultivation, and eventually inevitably leads to soil erosion. While the slope factor of commercial forest directly affects the water absorption rule and water seepage of slope, it also affects the impact force of water fow on soil structure and soil transport capacity, and finally changes the soil erosion on slope. In the actual logging of commercial forests, soil erosion caused by logging will be affected by mountain slope, especially in mountainous areas such as Yunnan province. The impact of slope on commercial forest logging impact assessment should not be underestimated. At present, there is a lack of systematic analysis and research on the slope of artificial commercial forests in Yunnan province. Based on the results of comprehensive monitoring of forestry and grassland ecology in Yunnan province in 2021, this study adopted the five-level slope classification method to make a table, and carried out statistical analysis on the artificial commercial forest area of each slope level in 16 major municipal administrative districts in Yunnan province, and summarized the distribution of artificial commercial forest area in the province and each city on different slopes. This study analyzed the correlation between the slope of logging site and soil erosion. Based on the research results of slope classification of artificial commercial forests in Yunnan province, provided reference for reasonable control of the clear logging area of artificial commercial forests in Yunnan province. Four clear logging methods based on slope classification are summarized as follows:（1） Block or strip clear logging is generally adopted;（2） the size of clear logging area depends on the topography and management level, and the clear logging area of each slope grade has different restrictions;（3） manual regeneration should be implemented after logging,or appropriately combined with natural regeneration;（4） on steep slopes and steep slopes that are prone to serious soil erosion, a reservation zone equivalent to the logging area should be retained on ridges, gullies and foothills.