Abstract: The experiment 1 investigated gender stereotype in children peer group activity by picture materials. The experiment 2 explored the reason that the behavior of gender exclusion emerged in different exclusion context. Subject were the kindergartener, and pupils in grade two and grade five. The results suggested: (1) In peer group activity, the children of three grades had obvious gender stereotype. (2) The gender exclusion behavior wasn’t only revoked by gender stereotype. (3) Children might include opposite sex peer because of moral and prosocial behavior, while exclude opposite sex peer because of group identity, group function and gender stereotype.

Key words: peer group, gender exclusion, exclusion context, gender stereotype, children