Intergroup contact effect refers to the situation of friendly interactions between individuals
and out-groups, especially when a friendship is established, which can effectively improve the attitude
to out-groups and reduce the prejudice. This article introduces the different types of intergroup contact,
discusses its mechanism, and introduces the corresponding theoretical model, focusing on the summary
and commentary on the influence of intergroup contact. Future research needs to focus on the different
valence of intergroup contact effect, compare the effect of different types of groups, and explore the more
long-term social effects of the effect of intergroup contact.