Meilong River catchment has been chosen to illustrate the influence of thrust faulting on deep-seated slope gravitational deformation in southern Taiwan. We identified morpho-tectonic features using the 1 m resolution LiDAR derived DEM, aerial photographs and field observations. In the 5.2 km2 catchment, over 10 deep-seated landslides sized over 10 ha have been recognized. Furthermore, a 700 m to 800 m thick faulted material composed of gouge, breccia and intensively fractured metamorphosed metamorphised argillite with thin bedded sandstone was found. Drilling cores from five boreholes with a depth of 120 m to 140 m also support the results of field observations. Fault slip data measured in the field exhibit thrust-type movement that can be used to differentiate faulted material from tectonic origin rather than from gravitation sliding. Besides, as the sliding behavior of identified deep-seated landslides is much more similar to homogeneous cohesive soil than rocks, most of deep-seated landslides observed in the catchments exhibits rotational sliding behavior, which is different from the plane or wedge sliding behavior in most rock slopes in mountainous region of Taiwan.