Citarum Watershed is categorized as a critical watershed due to erosion and environmental damage. Erosion is a continuing long-term problem because of its impact to the economic use and environment. The purpose of this study is to determine the distribution of annual soil erosion by USLE model using Geographic Information System (GIS). The four major input parameters affecting to soil erosion are rainfall erosivity factor (R), length slope factor (LS), soil erodibility factor (K), and land use factor (CP). The result showed that the average annual soil erosion was 122,76 ton/ha/year. The erosion hazard categorized into four classes which are low, moderate, high and very high. The low level of erosion is <15 ton/ha/year has about 2,47% area of low level and located in the north of Upper Citarum Watershed. The moderate level of erosion is 15 - 60 ton/ha/year has about 11,13% area of moderate level and located in the north, east, southeast and south of Upper Citarum Watershed. The high level of erosion is 61 - 180 ton/ha/year has about 78,53% of high level which dominates Upper Citarum Watershed. The very high level of erosion is >180 ton/ha/year has about 7,87% of very high level and located in south and southwest of Upper Citarum Watershed. The result can be used as a consideration for soil erosion prevention measures by local people and government to reduce soil loss.

由于侵蚀和环境破坏，Citarum 流域被归类为关键流域。由于侵蚀对经济使用和环境的影响，侵蚀是一个持续的长期问题。本研究的目的是利用地理信息系统 (GIS) 通过 USLE 模型确定年度土壤侵蚀的分布。影响土壤侵蚀的四个主要输入参数是降雨侵蚀因子（R）、长度坡度因子（LS）、土壤可蚀性因子（K）和土地利用因子（CP）。结果表明，年均土壤侵蚀量为122.76吨/公顷/年。侵蚀危害分为低、中、高和非常高四个等级。低水位侵蚀为 <15 吨/公顷/年，低水位面积约为 2.47%，位于上 Citarum 流域北部。中等程度的侵蚀为 15 - 60 吨/公顷/年，约 11.13% 的中等程度区域位于上 Citarum 流域的北部、东部、东南部和南部。高水平的侵蚀为 61 - 180 吨/公顷/年，约占上 Citarum 流域的高水平的 78.53%。非常高的侵蚀水平>180 吨/公顷/年，约占非常高水平的 7.87%，位于上 Citarum 流域的南部和西南部。研究结果可作为当地人民和政府采取水土流失防治措施减少水土流失的参考。非常高的侵蚀水平>180 吨/公顷/年，约占非常高水平的 7.87%，位于上 Citarum 流域的南部和西南部。研究结果可作为当地人民和政府采取水土流失防治措施减少水土流失的参考。非常高的侵蚀水平>180 吨/公顷/年，约占非常高水平的 7.87%，位于上 Citarum 流域的南部和西南部。研究结果可作为当地人民和政府采取水土流失防治措施减少水土流失的参考。