本研究以石門水庫集水區為分析區域，將集水區分為土砂流失(soil loss)及土砂生產(sediment yield)兩個方向探討。土砂流失部分，本研究發現水庫淤積的土砂來源以近河岸崩塌為主，視為主要關注之土砂流失量，利用政府資料開放平臺(data.gov.tw)之崩塌圖資，配合地理資訊系統(ArcGIS)進行空間分析；土砂生產部分，定為通過特定斷面之土砂，應用經濟部水利署之歷年石門水庫淤積測量報告，確切量化由上游集水區所運移之土砂生產。最後將上述兩者，配合水土保持局的歷年工程進行交叉比對，聚焦在山坡地保育利用條例範圍去探討，讓集水區土砂流失、土砂生產與保育治理措施得以反應其相對關係，發現隨著集水區保育治理措施的導入，土砂流失與生產已呈現逐年下降之趨勢，顯示各種保育治理措施已發揮了保土蓄水之功能，可以抵禦較大的降雨而生產較少的土砂。

In this study, the watershed of Shi-Men Reservoir was taken as the analysis area, and the water collection was divided into two directions: soil loss and sediment yield. In the part of soil loss, this study found that the source of soil deposited by the reservoir is mainly near the river bank landslide, which is regarded as the main concern for the soil loss. The landslide of the government open-data platform (data.gov.tw) is used together with ArcGIS. The sediment yield part is determined to pass the soil loss of a specific section, and the Shimen Reservoir sedimentation measurement report of MOEA Quantify the sediment yield transported by the upstream watershed. Finally, the above two will be compared with the previous years of the Soil and Water Conservation project, focusing on the area of Slopeland Conservation And Utilization Act, so that the soil loss, sediment yield and conservation project in the water-shed can be reflected in their relative relationship. With the introduction of conservation project in the watershed, soil loss and sediment yield have shown a downward trend year by year, indicating that various conservation and control project have played a role in soil conservation and water storage, which can withstand large rainfall and reduce sediment yield.