Taking tourism management undergraduates of a university in Anhui province as survey objects, this study collected data by the research methods of literature analysis, field research and in-depth interviews. With the help of psychological contract theory, it aims to investigate the influence of psychological contract violation on undergraduates' internship in hotel. The research findings are as follows: The lack of non-monetary rewards in hotels, the unfairness of monetary rewards and the defects of school internship management lead to the violation of psychological contract of interns; During the internship, interns seek for the transformation of psychological imbalance by the revision of psychological contract, and there are three different states of attachment, escape and adaptation; The external factors that influence the interns' attitude towards the hotel internship are the school education and the overall salary supply of the hotel, while the internal factors are the interns' revision of the psychological contract by selective attention and neglect.