The geological and geomorphological characteristics of the Dachaidan fault since the Late Quaternary were obtained through the interpretation of remote sensing data, field investigation, and differential GPS survey. The results show that the Dachaidan fault, with a total length of about 135 km, shows an inverse “S” shape. According to the change of fault strike, geomorphic characteristics, and fault activity, the fault is roughly divided into three sections, with Wenquangou and Tataleng Rivers as dividing points. The nature of reverse thrust has been obvious in the northern and southern segments of the Dachaidan fault since the Late Quaternary, and the middle section is dominated by dextral thrust activities. The reversed and strike- slip displacements are different on different geomorphic surfaces, showing obvious multi- stage activity characteristics. The paleoseismic profile in the field revealed a paleoseismic event, which occurred after (2 402.5±57.5) a.B.P., indicating that the fault was strongly active in the Holocene, consistent with the frequent strong seismic activities in the region in recent years.