The main representatives are Maslow (1908 ~ 1970) and Rogers (1902 ~ 1987). Maslow's main points are: to study and classify people's basic needs, which is different from animal instinct and puts forward that people's needs are developed at different levels; He arranged people's needs in a hierarchy from low to high according to the different goals he pursued and the objects he met. The lowest demand is physiological demand, which people think should be given priority. Rogers' main point: He developed the "self-theory" of personality in the practice of psychotherapy and the research of psychological theory, and advocated the "patient-centered treatment" psychotherapy method. Human beings have a natural motivation of "self-realization", that is, a person's tendency to develop, expand and mature, which is a person's tendency to maximize his potential.