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对金沙江流域水土流失、河道泥沙及主要影响因素系统作了分析，认为地质、地貌及气候因子是影响水土流失的主要因素，人为活动加剧水土流失的发生发展。河道泥沙主要来自金沙江下游，特别是下游干流河谷区间，流域的地面侵蚀与河道泥沙的空间关系不密切，影响输沙量的主要因素为年径流量和清水区年径流量，以及滑坡、泥石流等重力侵蚀，尽管水土流失治理对于流域的河道泥沙减沙效应显著，但短期内对流域干支流输沙量影响甚微。今后一段时间内金沙江流域河道泥沙不会有显著的变化
The paper analyzes the system of soil and water loss, river sediment and its main influencing factors in Jinsha River Basin. It is concluded that geology, physiognomy and climatic factors are the main factors that affect soil and water loss. Anthropogenic activities aggravate the occurrence and development of soil and water loss. River sediment is mainly from the lower reaches of the Jinsha River, especially in the lower reaches of the mainstream river valley. The spatial relationship between surface erosion and river sediment is not close. The main factors influencing the sediment yield are annual runoff and annual runoff of fresh water and landslides , Debris flow and other gravity erosion. Although soil erosion control has obvious effect on river sediment and sediment reduction in the river basin, it has little effect on sediment discharge of dry and tributaries in the short term. There will be no significant change in river sediment in the Jinsha River in the coming period