Abstract: Objective To understand the genetic characters of Yi’s head-face in Liangshan of Sichuan. Methods Nine genetics indexes, including mongoloid fold, eyefold of the upper eyelid, front tooth type, nasal profile, nostril form, chin projection, lope type, hair point of the forehand and hair form were investigated for 313 middle school students (204 males and 109 females) in Yi by using cluster random sampling method. Results (1) The rate of Mongolia fold is 58.47%, the rate of eyefold of the upper eyelid is 85.94%, the rate of shove-shaped front tooth type is 95.85%,the rate of umbonate nasal profile is 2.87%, the rate of wide nostril is 77.32%,the rate of protruding chin is 4.15%, the rate of ear lope is 72.84%,the rate of pointed hair point on forehead is 37.70% and the rate of curly hair form is 23.00% in Yi. (2) Eight indexes showed no sexual difference except for the rate of point of the forehand. Conclusions There are differences between Yi and other nationalities in genetic characters of head- face.

Key words: mongoloid fold, eye fold of the upper eyelid, front tooth type, nostril form, Yi