For studying the compression characteristics’ law of Xigeda filling in the condition of mixing sandstone particles, 7 groups of test plans are set. Based on equivalent replacement of gradation, the method of putting sandstone particles into filling of purple mudstone by using the same quality replacement is taken to explore how the factors, none-having and having sandstone particles, the changing of dry densities with sandstone particles and the ratios of having sandstone particles, affect the compression characteristics of red-bed soft rock padding. The changing regulars of stress-strain curves and compression indexes are also analyzed. The experimental results showed that compression modulus will be increasing and compression coefficient and compression index will be decreasing if the Xigeda filling is mixed with sandstone particles in twenty percent. Furtherly compression modulus is increasing with the proportion of mixing sandstone particles getting higher, and compression coefficient and compression index is decreasing with the proportion getting higher. When padding is mixed with sandstone particles in twenty percent, compression curves present a shape of broom and have a convergence trend along with stress increasing on the condition of different dry densities. And if the dry density is 2.0 g?cm-3, compression curves also exist a convergence trend with the axial stress nearly 0.20MPa according to different proportion of mixing sandstone particles. It is suggested in actual projects that magnifying the proportion of mixing sandstone particles and increasing weight of compaction could improve compression feature of Xigeda filling.