The existence of the surface rupture along the south segment of Minjiang Fault has been a controversial issue in recent years. The study area is located in the middle segment of the north-south seismic belt, amid strong seismic activity. The 1933 Diexi earthquake in the study area was an important earthquake in modern history, but the seismogenic fault of this earthquake is still not clear. In 2017, the Jiuzhaigou M7.0 earthquake occurred in the study area. Therefore, the seismic risk analysis of the south segment of Minjiang Fault is very important, and the existence of the surface rupture is the first thing to check. In this paper, we denied the existence of the surface rupture along the south segment of Minjiang Fault, and analyzed the causes of the abnormal negative orography on Manaoding.