As the saying goes, "birds of a feather flock together, people flock together". People who live in the same area, work in the same occupation, or belong to the same race always have some similar characters, accents, and behaviors. Therefore, the stereotype effect has some reasons. But after all, this is a general, abstract and general view, which can only be regarded as a general impression, and can not determine the specific quality of each individual. If we simply classify them, we will make the mistake of generalizing and peeping at them.