Abstract: Mutli?grade slope breaks were found in Xiazijie slope area of Mahu depression, Junggar basin.3?D seismic data, combined with logging data and field reconnaissance information were used to study the characteristics of these slope breaks. Based on the genetic mechanism, the slope break can be classified as fault slope break, flexure slope break and erosion slope break. Considering with the seismic profile features, it can be further divided into 5sub-categories. The plane positions and the grades of the slope breaks with sand?body controleffect before Triassic deposition can be determined based on their lateral and vertical distribution characteristics. The fault slope break is considered to be the main type in this area, and it plays a significant controlling part in sand body distribution in lateral and vertical, which includes sand facies, sand thickness, sand layer number and sand evolution, etc. Finally, 5kinds of sand?body control models are established, such as groove control, fault control, slope barrier, slope step and slope intersection on the basis of statistics of these slope breaks and sand distribution