Abstract：Taking two new and old landslides，located at Xingma Middle School and Dahe Middle School in Nanjiang County，Sichuan Province，as topical cases，a new translational landslide named plate-shaped landslide is presented analyzed through these two cases. The characteristics of such landslides are thin rectangular plate，with the length of the longitudinal axis of the plane shorter than the lateral axis. And it is like a thin plate in section. The main geological setting of this kind of landslide is thick sandstone rock bed inter-bedded with a mudstone rock bed on the bottom，in which there is a long discontinuity developed inside the slope which parallels to the slope angle. The discontinuity will develop into a tension crack when the heavy rainfall occurs and it will be infilled with water quickly till the water table reaches to a certain critical level. The hydrostatic pressure will push the block on the free side out and such movement will stop when the water table in the crack drops with the crack being large enough. A systematic study of the lithology background，tension crack contain water as well as the rainfall triggering factor condition is carried out. Based on the study，in light of the deformation pattern of the plate-shaped landslide，some measures to treat the landslide are provided，which include operating the drainage project to make sure the water can be drained in the crack，setting a short pile or anti-sliding block outside in the toe of slope to prevent the sliding movement，and setting beams or anchorage cables between the blocks on the top of slope to control the deformation which is caused by tension cracks.
