Paleogeomorphology is an important controlling factor on deposition of beach-bar sand bodies. It determines the size and characteristics of beach-bars. In order to analyze its controlling effect on beach-bar deposits，we restored the paleogeomorphology of the LST of SQ2 in the fourth member of Shahejie Formation in Shubei area of Liaohe Western Sag using sequence stratigraphic analysis and impression method by five steps：residual thickness obtaining，true thickness correction，compaction restoration, determination on denudation area of buried hill and paleo-water depth reconstruction. In general，the paleogeomorphology in the study area is high in the west and low in the east. The slope is in the west and the sag is in the east，and the paleo-uplift is in the middle of the slope zone. According to the paleogeomorphology，the Shubei area was divided into five units：coastal zone，buried hill zone，north slope，south slope and sag area. Beach-bars developed mainly along the coastal zone and at the margins of the paleo-uplift. The paleogeomorphology controls the water distribution range and its relative depth，hydrodynamic intensity，sedimentation topography，provenance transport channel and unloading places，all of which affect the deposit of beach-bar sand bodies and further control the development of beach-bar sand bodies.