The study expounds the structural changes of hippocampus, basal ganglia and OFC and the
existing mechanism of multiple personality in the physiological level of DID.; the psychological level is
mainly the dissociation caused by the combination of attachment complex caused by childhood abuse in
other three common cognitive models; the social level discusses the influence of family and society on the
childhood and adulthood of DID patients, which will help analyze the formation mechanism of DID from
the perspective of integration and put forward the corresponding treatment methods.