Abstract: Samples of 170 middle school students of Nu nationality were investigated on 7 behavioral traits of lateral functional dominance including handedness, hand clasping, arm folding, leg folding, foot preference, stride type and eye preference. The results are as follows. The preferences of the right type on 7 traits are much higher than that of the left type, except stride type. There is sexual difference on the preference of leg folding and eye preference and that of foot preference is significant while there is no sexual difference with the rest items. There is no significant difference between Nu and other 8 ethnic groups on the preference of 7 behavioral traits, except that of the stride type and hand clasping. The correlations are found among 5 groups of the traits, that is, hand clasping and handedness, arm folding and leg folding, arm folding and foot preference, arm folding and eye preference, eye preference and stride type.The preference of R-R type is much higher than that of the L-L type.

Key words: handedness, hand clasping, arm folding, leg folding, foot preference, stride type, Nu, handedness, hand clasping, arm folding, leg folding, foot preference, stride type