The question is often raised: “Psychoanalysis, is it scientific? I. Causation and Purpose Theory Science follows the “causation theory”; humanities follow the “purpose theory”. Freud believed that “the subconscious mind determines the conscious mind”. The theoretical orientation of Freud’s psychoanalysis, in fact, follows the scientific theory of cause and effect. At the same time, Freud also believed that the inner subconscious desires and needs become the deep source of motivation (pushers) for conscious activities (cognition, emotion and behavior). Therefore, Freudian psychoanalysis transcends the limitations of scientific causation and is characterized by both “causation” and “teleology”. In short, psychoanalysis is the unity of causation and teleology within the psyche. Freud’s theory emphasizes the “meaning of symptoms”, for example, the primary and secondary benefits of symptoms, i.e., the existence of symptoms, to some extent, satisfies certain psychological needs of the patient. Symptoms, including various behaviors, have deep-seated desires and needs behind them as the source of psychic motivation for their creation and maintenance. It can be seen that the teleological orientation of Freud’s doctrine has been developed into the theory and technique of “postmodern psychotherapy” by later generations. Postmodern psychotherapy can be traced back to Freud’s concepts such as “false memory syndrome,” and Freud is therefore considered to be the “first person” to develop postmodern psychotherapeutic theories. Psychoanalysis not only reveals the truth of the subconscious mind and explains the causal relationship between the subconscious mind and the symptoms, but also constructs meanings in the heart of the visitor. The interpretation of dreams is a typical example of meaning construction. Second, “past” or “present”? Some people say that “Freud always discusses the past, not the present. This is actually a misunderstanding of psychoanalytic therapy. The subconscious mind is an objective phenomenon of mental functioning. The subconscious mind is formed by self-repression. The subconscious mind comes from past life experiences and has various influences on the patient’s present emotions and behaviors. Freud’s discussion of the “past” with the patient is in fact his work on the patient’s deep subconscious to help the patient solve the current difficulties. Split and Integration In psychological talks, even if the therapist does not discuss the past life experiences, traumas, desires, etc., but only discusses the current psychological activities, cognitive behavioral therapy. In this, we always can’t avoid discussing with the visitor about his/her current emotions, right? In fact, emotions are the attitudinal experiences when the inner needs can be satisfied. The emotions of the moment contain deep-seated desires and needs. These emotions and needs are what psychoanalytic therapy includes and involves. There is a difference of opinion between the benevolent and the wise. The founder of various psychotherapeutic methods always emphasizes the importance of a certain aspect of the mind and the uniqueness of the therapeutic theory he invented. In fact, the visitor’s mind is an organic unity of cognition, emotion and behavior, which affects the whole body. Therefore, whether it is changing cognition first, or changing behavior first, or subconscious realization, ultimately it is the overall change of the whole picture of the mind such as cognition, emotion and behavior. Various different branches of psychotherapy theories, in the process of historical development, gathered into a huge river. Psychotherapists, in the process of learning psychotherapy theories, will also integrate a whole set of psychotherapy theory system within themselves. When the psychotherapist meets with the visitor, these different theoretical schools are integrated again and again by the visitor. Ultimately, the holistic development of the visitor’s entire mind is promoted. In retrospect, nowadays, if a certain psychotherapist is claiming to be a therapist of a certain school of thought, in fact, he himself is often very limited, or even just starting out and on the path. Conclusion It is hoped that the academic division of psychotherapeutic theory schools will no longer become a prejudice and fight between schools, and will no longer become a stumbling block for psychotherapists in their theoretical learning and clinical application.