Abstract: By processing the Airborne L-SAR image of the study 0xea，we selected the weak-information of SAR image as indicator of subordinate faults，and traced the structural background of landslides in the region. The regional fault in the study area is the NE strike-slip fault Its sinistral movement forming a serial subordinate faults，including R plan，P plan and R’ plan，which are represented as weak information of lineation in radar image and related to the development of micro-geography. By selecting and enhancing the weak information， we made the deformation frame of subordinate shear faults. Together with field investigation, we found that the location of P shear plan on the northeastern Jubilee Reservoir can form 1ands1ides of gravity unbalanced alluvium, with a background of strong strain deformation belt. The newly formed landslide of bou1der falls was 1oeated at southeast of Jubilee Reservoir It has features of structural tension background，and relates to the subordinate faults with pull-apart action on the direction of the R shear plan.