Abstract: The main characteristic of soft rock is high element content, low strength, unstable feature, easy weathering and disintegration, poor adaption, which was limited on railway and highway. The stuffing's engineering character is not exactly understood, through the years' traffic circulation load or natural erosion,Serious disease will be caused by filling with stuffing's railway and highway road. This experimental research used dynanlic compaction for molding subgrade reinforcing, strengthened the density of the filled stuffing to improve its adaption, as a result, the dynanlic compaction's effect significantly after testing.