Abstract: The sand bodies dominated by near shore shallow lake beach bar facies are well developed in the Es4 of the Linnan Sub-sag Belt. The region has become one of the important exploration targets in recent years. Because of the development of igneous rocks, and poor quality of seismic data, the distribution and development of beach bar sand are not clear. Therefore, based on the deepening research of the palaeogeomorphology and sedimentary features in the upper Es4, the resolution of seismic data is improved by using frequency spectrum decomposition technology. The forward modeling and attribute analysis technology is used comprehensively. The development pattern of beach bar sandstone is predicted in this paper and proven effective.