The paper takes the Yan10 Member in the Z205 Block at the southwest of the Ordos Basin as an example. Starting from data such as core, well logging, and logging, this study mainly utilizes the theories and methods of oil and gas reservoir geology to analyze the intralayer heterogeneity, interlayer heterogeneity, and planar heterogeneity of the Yan10. The focus is on analyzing the four properties characteristics and their relationships of two types of dominant microfacies sand bodies in the channel subfacies of braided river facies. This study suggests that the central bar and channel sand of the Yan10 braided river channel in the Z205 Block are well developed, forming dominant microfacies sand bodies; The permeability rhythm types such as compound positive rhythm and compound negative rhythm are mainly found in braided channel sand bodies of the Yan10; The degree of heterogeneity within each Sand group in the Yan10 is mainly moderate heterogeneity; The lamination factor of the Yan102 is big and the sandstone density is high. The lower interlayer of the Yan10 is more developed than the upper one; The central bar and channel sand microfacies areas have good sand body connectivity, and their porosity and permeability are relatively high in the Yan10; The central bar is mainly composed of medium sandstone and fine sandstone, and the lithology of channel sand is mainly composed of fine sandstone and siltstone in the Yan10; The logging spider web diagram of the central bar is an approximate pentagon, while the channel sand is a more regular hexagon in the Yan10; The oilness of the central bar sand body is better than that of the channel sand sand body in the Yan10; The lithology and physical properties of the central bar are better than those of the channel sand in the Yan10; The middle sandstone has the highest oilness, followed by the fine sandstone in the Yan10; AC is positively correlated with logging porosity, and CNL is also positively correlated with logging porosity in the Yan10; Porosity, permeability, and oil saturation are all positively correlated, with a moderate positive correlation in the Yan10. This paper provides an important basis for the evaluation of the Yan10 reservoir in the region, and also provides a reference for the study of four properties relationships of the dominant microfacies sand bodies of central bar and channel sand in the sandy braided river.