[Objective] The influencing factors of landslide were explored in red rock area of East Sichuan Province in order to provide a theoretical basis for the prevention and control of landslide in this area. [Methods] A comprehensive survey related with landslide was carried out in red rock area of East Sichuan Province, influential factors of landslide and their coupling intensities were analyzed using the third theory of quantification.[Results] The first contributing factor of landslide in red rock area of East Sichuan Province are strata dip, landslide height and the free surface height. The second contributing factors are land use situation and rock composition relationships. The third factors are outside forces and human engineering activities and rock era. The main control factors include annual rainfall, Jurassic era rock, less than 50 m landslide height, rock inclination between 5°~15°, thick sandstone or mudstone with thin mudstone or sandstone, free surface height between 5~15 m, dryland land use and river erosion and human activity. [Conclusion] In different landslide samples, though the coupling strengths of different factors were different, they were verified in comparison with field investigations. Therefore, the validity of the method is proved.