Abstract: A large number of reverse growth faults occur in Wu-Xia fault belt of Junggar basin. This paper presents the analysis of the growth index of fault and the combination relations among faults and gives five types of lateral combinations of the faults like parallel, en echelon, oblique, orthogonal and brush ones. The study shows that in Permian, the faults mainly grew and distributed along NE direction, during Triassic and Jurassic, they distributed in crosscutting and superimposing and arc-like appearance along EW trend. The faults activities are characterized by subsection in space and segmentation in time, at the early time the faults activities were stronger in the west than in the east, however, at the late time things were opposite; from Permian to Jurassic the center of fault activities migrated from west to east, with gradually weakening of intensity.

Key words: Wuerhe-Xiazijie fault belt, fault, growth index, structural migration