Abstract: According to the sedimentological principles and existing data, the preservation and distribution of the fall-siltseams in the channel bar of the perennial sandy braided river are discussed in this study with the aid of monofactor and multi-factor analysis, and three types of distribution are constructed for the fall-siltseams, i. e., the fornix type, subhorizontal type and monoclinal type. These distribution patterns of the fall-siltseams are mostly influenced by the channel bar evolution and successive erosion and reworking in the perennial sandy braided channels. The results of research in this study have assisted in the refinement of the model for the fall-siltseams in the subsurface sandy braided river reservoir rocks, and thus have important practical significance.