After the impounding of the Three Gorges Reservoir, the natural river channel became reservoir area, and the characteristics of flood wave routing changed significantly and controlled by the discharge of inflow and the water level before the dam. Based on the MIKE11 model setup in the reservoir area, the flood routing time were calculated for different cases, other elements combined to the routing time also computed including the flow velocity, the kinematic wave celerity and dynamic wave celerity in each scenario. By validation and analysis the results, some general conclusion can be reached for the characteristics of the flood wave routing along the reservoir area.