In view of the problems of poor soil conditions and high flatness requirements in the dredger filling engineering,the flatness control was studied.Through the on-site measurement of elevation and the review of the slope ratio of the dredger filling area，and the calculation method of earthwork balance,the spacing of the trunk line layout and the layout of the pipeline interface were determined.After the completion of the project,it is shown that in the medium coarse sand dredger filling engineering，the method of arranging branch pipe spacing of 40 m and controlling the elevation and progress according to the bottom elevation，can effectively shorten the mechanical leveling time of the dredger filling area and save the cost about 473,000 yuan.