Objectives: Based on the investigation of the formation and evolution of the Hangjinqi fault zone in the northern Ordos Basin, this paper discusses the displacement evolution characteristics and influencing factors of the fault zone from the Late Carboniferous to the Middle Triassic through the fault displacement-length relationship study. Methods:Through a series of seismic section interpretations, throw and dip angles of these faults are measured. Through the stratum recovery analysis, the displacement along the faults in different periods and the location of the ancient fault tips are approximately calculated, the history of fault growth connections is determined, and the displacement-length relationships in the evolution of the reverse faults is analyzed. Results: The evolution of the Hangjinqi fault zone is controlled by the basement faults. Among them, the NE-trending fault zone evolved earlier, mainly in the form of displacement growth. The soft linkage between the fault tip and the overlying fault zone resulted in an increase of local displacement and eventually a hard linkage. the EW-trending fault zone developed in the later stage. The fault segmentation, lateral propagation, and connection process are involved; the fracture activity in the central adjustment zone is relatively weak and locally reversed. Conclusion: We find that the evolution zoning characteristics of the Hangjinqi fault zone from the Late Carboniferous to the Middle Triassic include: the east-west basement fault zone, the northeast basement fault zone, and the intermediate adjustment zone. Based on the geometry of the fault displacement-length profile and the analysis of the fault evolution stage, four types of reverse fault displacement patterns can be simply classified: ① Nearly symmetric triangles and ellipses, representing a single fault; ② The left-right asymmetric zigzag or double peaks, representing soft linkage between faults; ③ Irregular wavy, reflecting the connection of multiple faults; ④ Abnormal peaks, representing late displacement adjustment of large thrust fault zones. Furthermore, the evolution of the Hangjinqi fault zone has experienced a complex process of fault growth and connection. As the evolution of the fault zone, the ratio of the maximum displacement to the length of the fault will change. Compared with the stage of fault connection, the Dmax/L of the soft connection and the connected mature fault will be higher, but the overall trend is increasing.