Abstract: Abstract After completion and operation of the Shuibuya Project on the Qing jiang River ,most suspended load and entire bed load upstream of the dam will be retained and sediment deposition will occur in the reservoir area consequently .Calculation and analysis of reservoir sedimentation for the reservoir are carried out under the proposed scheme of operation(400m,391m,350m scheme )by means of 1D flow and wdeiment mathematical model .The results show that the deposition of the suspended load mainly occurs in the dead storage and has little effect on the effective storage; the sediment deposition has no obvious effect on flood stage when 5% and 20% probability floods occurs at the end of 20 year operation of the Reservoir.