Freud divided the personality structure into three structures: id, ego and superego, which play different roles in personality.

The concrete contents of Freud's personality "three self" structure are as follows:

Id: Follow the principle of happiness.

The id contains basic internal drive and reflection, and it is in the "subconscious" state. It is located at the bottom of the personality structure, and it is an energy system composed of innate instincts and desires, including various physiological needs. In fact, this personality can be understood as a "collection of desires", and any behavior that can satisfy one's desires can be done.

Self. Follow the principle of reality.

The ego gradually differentiates from the id and is located in the middle layer of the personality structure. Its function is mainly to adjust the contradiction between id and superego. Ego is permanent, and superego and id are almost permanent opposites. In order to coordinate the contradiction between id and superego, ego needs to be adjusted. If individuals are under too much pressure from ID, superego and the outside world, they will start the defense mechanism. Defense mechanisms include: repression, denial, offset, projection, sublimation and so on. This personality is actually the real personality in real life.

Superego: follow moral principles.

I am an ideal part of personality structure, which is formed by internalizing the moral norms and values of social and cultural environment in the process of individual growth. Its main function is to supervise, criticize and control its own behavior. Superego I often say that I am a "white flower" in everyone's personality and have a lofty sense of moral responsibility.