Treating the anxiety of a college girl who is unable to express her aggression basing on the perspective of psychodynamics. Having been thinking about the shortcomings of all the people around, the client can not concentrate on preparation for the postgraduate entrance examination and then became quite anxious, which lasts for over two months. The counselor applies the concepts of defence mechanism, mirror stage, true self and false self etc. to understand the the core symptoms of the client. By acting as a good enough object, providing a holding environment and giving mirror responses, the counselor helps the client to release aggression, to integrate the good and bad cognition of her parents and to reconstruct her self-cognition.