In the experiment, sea mud, mountain soil, 10%, 15%, 20% of sea mud mixed with cement (pile) soil were used as embankment filling materials. In this paper, the most suitable material for embankment filling material was studied from the aspect of consolidation characteristics. The basic physical and mechanical parameters, compression coefficient and consolidation coefficient of the sample were obtained through the basic physical and mechanical property test and standard consolidation test. Then the sample was analyzed from the angle of consolidation compression deformation and consolidation rate. The results show that:(1) the compression deformation of natural sea mud is the largest, and the consolidation rate is the smallest. (2) The compression deformation of natural mountain soil is the smallest, but the consolidation rate is lower than that of cement (pile) soil mixed with sea mud. (3) With the increase of cement content, the compression deformation of cement (pile) soil mixed with sea mud is the smallest, and the consolidation rate is the smallest compared with that of sea mud and mountain soil, but the cement content has the least effect on cement mixed with sea mud The consolidation rate of soil (pile) has little effect. Therefore, from the perspective of consolidation characteristics, it is concluded that the cement (pile) soil mixed with 20% cement is the most suitable material for embankment filling.