In order to fully verify the rationality of bend style diversion project general arrangement and whole flood discharge capacity after the secondary reconstruction, the paper studied the water diversion, flood discharge and sand transport of Tschmirick diversion project of Gez River. The results indicated that the project general arrangement and structural layout of buildings after reconstruction are basically rational.The hub's flood discharge ability meets design requirements, but there are the serious problem of sediment accumulation before intake sluice and artificial bend inlet. The effects of water diversion and sediment control can be improved obviously by raising the altitude of sluice sole plate and setting additional submerged groins at the right bank of artificial bend inlet; The scientific operation and management scheduler is the important measure for the guarantee of hub smooth spillway, flood discharge,diversion and highly effective desilting and safe operation.