Abstract: Soil and water conservation is an important part of ecological civilization construction, an important measure for river management, an important basis for comprehensively promoting rural revitalization, and an effective means to improve the quality and stability of the ecosystem.Faced with the complex and widely distributed erosion environment in China, as well as the constantly accelerating erosion control policy direction, the current remote sensing monitoring results of soil and water loss still cannot meet the precise control needs of soil and water conservation. At present, there are a large number of loss areas in China that are not suitable for treatment or have no treatment potential. The existing remote sensing monitoring results of soil erosion at the regional scale are difficult to meet the precise discrimination and evaluation of governance potential, suitability, and urgency.Exploring spatial positioning technology for soil and water loss plots, scientifically and quantitatively carrying out refined discrimination and evaluation of the severity and suitability of soil and water loss in small watersheds, is an effective means to promote the development of governance work in a deep, broad, detailed, and practical direction.This study takes Pu'an County, a karst area in Guizhou Province as an example, using the "three-layer iteration" spatial identification method for soil erosion plots, inheriting and connecting remote sensing monitoring results of soil erosion, obtaining soil erosion plots, and identifying suitable control objects. In order to provide technical support and decision-making basis for steadily improving soil and water conservation rate, the priority management degree of small watershed was evaluated quantitatively based on the two dimensions of soil erosion severity and appropriate management degree.The results showed that the soil and water loss in Pu 'an County was mainly concentrated in cultivated land, forest land and grassland, which accounted for 60.12%, 25.77% and 7.73% of the total soil and water loss in the county, and the other small parts were distributed in gardens and other land use types.Compared with the results of remote sensing monitoring, the relative error of the total area of soil and water loss was less than 1%, and the relative error of the area of different land use types was less than 5%.The overall accuracy rate of grading the erosion intensity level of soil erosion plots is 95.82%.The focus of soil and water loss in Pu'an County is concentrated on arable land, forest land, and grassland. The priority of small watershed management is greater than 0.6, accounting for 6.31% of the total small watershed in the county.According to the principles of centralized contiguent and easy control, soil and water loss control strategies are formulated, and the expected reduction of soil and water loss area is simulated and analyzed. It is estimated that 3.44km² of soil and water loss area needs to be controlled by 2025, 43.35 km² from 2023 to 2030, and 46.26 km² from 2030 to 2035, achieving the goal of phased soil and water conservation rate.Based on "county - small watershed - plot", this study carried out multi-level soil and water loss control strategy to achieve systematic management and classified policies. Research can provide technical support and scientific decision-making basis for precise prevention and control of soil erosion, regional soil and water conservation planning, steady improvement of soil and water conservation rate, and effective implementation of soil and water conservation target responsibility assessment.