Maduo-Gande fault is an active fault within the Bayan Har block. There was an earthquake rupture zone on the Gande segment of Maduo-Gande fault zone. The authors found that the length of the rupture zone is about 50 km, with the general trend of NW. The maximum sinistral-horizontal dislocation is about 7.6 m and the maximum vertical dislocation is about 4 m. A large number of earthquake traces were found along the rupture zone and the surface rupture phenomena were also various. The authors believe that the rupture zone is due to a strong earthquake in the history of the area. And it is inferred that the Maduo-Gande fault in the Bayan Har block had intense activities since Late Quaternary and may still be active nowadays.