This invention discloses a method for damming by using mixed mud from sintering process and Bayer process. In this invention, the gibbsite Bayer process and sintering process red mud are mixed in the ratio of (0.43-2.33):1(dried mud) are used for the damming. Bricks are used for building cofferdam columns, in which are placed the vertical tubes which are then connecting filtration tubes and water-drainage ditch. There are permeating holes on the walls of the tubes. Between the column and its tube filled is fine sands. Due to the material of the dam is the same as the material decking-up, it makes simple building process and saving area for decking up Bayer process red mud. Advantages are low cost and saving raw materials.