Mentalization means the ability to observe oneself from the outside and understand others
from the inside. Sandplay Therapy is a method of psychotherapy and counseling which is widely used
and continuously developing. This paper discussed the rich mentalization functions contained in
Sandplay Therapy from four aspects: the relationship between the counselor and the client; the position
of the counselor; the intensity of emotional involvement and the characteristics of dialogue. At the same
time, the application of these functions in the intervention of personality disorders, the psychological
nourishment of children and adolescents, and the self-growth of counselors are also prospected.