Abstract: Landslides in existing soil and rock debris slopes have become one of the major hazards in projects. The physical, hydraulic and mechanical properties of debris landslide are summarized systematically in this paper. They are the physical, mechanical and permeability properties of sliding-body, the particle composition, chemical components, microstructure, physical properties, mechanical properties and weakening properties of sliding-zone soil. The analyses are based on the engineering geological conditions of debris landslide and extensive literature review and engineering practice, According to the engineering geological characteristics of debris landslide, both engineering geological and hydro-geological models were deduced. They provide a reference for the determination boundary conditions of groundwater seepage induced by rainfall, water level fluctuation of reservoir and rivers in sliding-body. Finally, various prevention measures of debris landslide are systematically summarized.