Abstract: A sample of 1852 middle school students from 3 nationalities ( Han, Mongol and Chaoxian) in Xing' an League wasinvestigated on 7 behavioral traits of lateral functional dominance ( handedness, hand clasping, arm folding, leg folding, stride type, foot preference and eye preference) in Spt., 1998. The result is as follows. (1) In all 3 nationalities studied, the frequencies of right type were over 50% in most traits. ( 2) The frequencies of the 7 traits except handedness, leg folding, foot preference and eye preference, showed differences among 3 nationalities. (3) The frequencies of most traits had no sexual difference. (4) Between the traits, the correlation is high. In each studied pair of the traits with correlation, the two relevant phenotypes usually showed the same lateral functional dominance.

Key words: Behavioral trait of lateral functional dominance; Han nationality; Mongol nationality; Chaoxian nationality