In Skinner view, language behavior can only be studied by observing the world around language users, that is, by observing external factors.In the process of language learning, an important external factor is the frequency of using certain words in the children's environment.If a child imitates the language of his environment to a certain extent, imitation is an important factor in the process of language learning.The result is that frequency affects children's language development.In addition, to reach a higher level of language, it needs to be strengthened.