Abstract: Under the action of increasing water head difference, seepage erosion will occur in the soil, and eventually evolve into seepage failure, threatening the safety of embankments and other earth-rock buildings.Therefore, it is of great significance to master the compression behavior of soil under different seepage erosion degrees to evaluate the stability of embankments.For unstable clay and unstable sand, a seepage erosion test was carried out under different water heads (below the critical hydraulic gradient) first, and then a compression test of the eroded samples was carried out.The results showed that the critical hydraulic gradient of unstable sand was lower than that of unstable clay, and seepage failure was more likely to occur.The e~lg p compression curves of unstable soils with different degrees of seepage erosion are linear under high stress state, and the corresponding compression index λ is not much different.The final normal consolidation line of soil gradually moves down with the increasing of erosion degree, indicating that seepage erosion significantly changes the soil structure, the higher the erosion degree, the easier the soil is compacted, and then the gravity subsidence occurs.