The grey deposition model is presented and the grey incidence analysis is applied to research the relationship between the deposition of the Fenhe reservoir, water inflow and precipitation on the basis of study on its exploiting state and sedimentation characteristic. The deposition of the Fenhe reservoir is forecasted and the relation between the deposition and the rainfall of the Fenhe reservoir is studied. The results show that the underlying surface is the most important reason to deposition, and 345.14 ×104m3 in 2012, and 177.07 ×104m3 will be silted up in 2015. The results tell us that long views shoule be taken in the soil-and-water conservation measure in semiarid area. Results indicate that the grey system method is of great flexibility.
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