Abstract: This paper analyzes the existing problems of flood-control system of lower Yellow River,such as the pond near the river,the dike heel river,the depression near the dike,the channel near the dike,the well near the dike and so on.The pond near the river easily causes the dike base leakage and piping;the dike heel river easily causes the flood and the main channel displacement;the well near the dike easily causes the permeable channel.According to the rules of solving the problems such as,the near dike,the back river and the important parts and so on firstly,this paper also gives us the methods to solve the problems.