In order to explore rainfall response mechanism of loess-bedrock landslide, this paper has discussed groundwater level response characteristics of Lingnan landslide under rainstorm and successive rain and soil stress-strain characteristics under corresponding stress path. The failure mechanism of the loess-bedrock landslide were studied in the paper. The results  show that 1) the landslide mass is silty  loessial clay. The landslide bed is glutenite. The mass and bed are featured by lower osmotic coefficient and high imperviousness; 2) the muddy loess flow and block slide are the main models of motion instability of Lingnan landslide; 3) the ground water level of the slope has increased drastically in 235.5 mm successive rain compared with 103 mm rainstorm; and 4) the silty loess of landslide mass is characterized with dilatancy.oft-com:office:office" />