Abstract: The river characteristic and the operation condition of the Gezhouba hydro project are introduced in this paper. The analysis using the measured data shows that the characteristic of the runoff and the sediment discharge after the Gezhouba hydro-project operation is as same as before The variation laws in reservoir area,which are scour and deposit quantity,distribution and the time that achieve dynamic balance of sediment,are studied. These factor variation laws are also studied within below the dam area. The descend reasons,values and vary process of river bed elevation and water level are summarized.This result can provide reference to recognize the reservoir deposit laws when the Three Gorges is operated in conjuntion with the Gezhouba hydro project.