Aiming at the problems such as earth surface layer silt uneven distribution,difficult tobroken sandstone,large earthwork of rock block backfill and deep backfill thickness in some parts ofthe northwest district of China,considering the adaptability,efficiency,work-period and cost of thesite foundation treatment in high pressure converter station,puts forward the schemes of dynamiccompaction foundation treatment. The application result shows that the method has the advantages ofquickly to improve the compaction degree and preconsolidation,promote the physical andmechanical properties and reduce the late settlement of the fill soil,and reduce the foundationsettlement of ground building and equipment,which can be widely applied in construction project ofUHV converter station and other large earth-rock excavation,backfill and foundation treatment inthe northwest district of China.