This paper attempts to reveal through case analysis that psychological activities are a set of programs and that the cause of mental illness is error in operation of the programs or the establishment of erroneous programs. By modifying or learning to use these psychological programs correctly, mental illness can be treated precisely and thoroughly. The complete psychotherapy process is represented by the following: psychoanalysis + modification of psychological programs.In order to perform certain tasks, life bodies need to initiate a series of psychological or physiological activities, which is the process of psychological or physiological activities called "psychological program". Psychological program is an abstract concept, and it is not a material entity. The search for psychological activity programs mainly depends on psychological analysis and scientific hypnosis.