The faults in the Anhui section of the Tan-Lu fault zone belong to the southern part of the faults zone. The fault structure is complex. On the whole,the fault activity is weaker than that of the Shandong and Jiangsu segment. In recent years,the author has carried out geological survey in the border area of Jiangsu and Anhui Provinces,and found that there are great differences in the topography of the Huaihe River on both sides. This work focuses on the east segment of the Tan-Lu fault zone in the south of Huaihe. We have dug two geological trenches,crossing the faults on the north side of the Ziyang hill. Trench Tc1 shows that there are two active forms of the faults,thrust and extension. The faults extend into the Quaternary strata. Based on strata ages,the results show that there is a strong activity in the late Quaternary period,and the newest age of activity is the late Pleistocene to early Holocene. The trenchs show that the faults have a variety of motion characteristics,which show the multiple phases of fault activity and the complexity of regional tectonic stress field.