Abstract: China's loess wide distribution, collapsible soil thickness from a few meters to dozens of meters, according to the characteristics of the traditional engineering foundation treatment methods adopted by cushion method, dynamic consolidation method, compaction method, grouting method, foundation method can deal with the traditional treatment and can meet the thickness requirements. And meet the requirements of bearing capacity, while the deep hole dynamic compaction method can also meet the above requirements. The author of a design, gravity wet deep strong in a 750 kV substation engineering foundation treatment of loess site by the consolidation of the composite foundation construction and treatment effect test study to conduct a comprehensive analysis, and put forward relevant proposals.