The paper analyzed the periodical evolution of the Fenwei Graben Basins based on their geomorphic-sedimentary characteristics. Field works found all the basins in the graben had experienced three fast paleolake regressions or intensive down-incisions of the rivers, and there exist a sequence difference in the occurrences from the Wenhe Basin, the Linfen-Taiyuan Basin to the Datong-Yangyuan Basin. The facts show that the far the basin is from the Tibetan Plateau, the later the paleolake regression or the down-incisions of the rivers took place. Taking these facts and the former research results in term of the mechanism of the local paleolake regression-transgressions, the paper put forwards that it is under the influence of the compressive uplift of the Tibetan Plateau, not the subduction of West Pacific tectonic plate under the Eurasian Plate.