The loess covers the extensive areas in China, but tie active faults in the loess ahe often ignored. This paper systematically describes the various characteristics and the evolutionary processes of the loess faults. Together with a number of data in sedimentlogy, Geomorphology and Seismology, the author further divides the active faults of the loess into two types of different feature——the slow creep and the quick rupture. on estimating the trend of the future earthquake the later should be paid enough attention to.