The purpose of this study was to investigate the pattern of social adjustment of chronic schizophrenics and to compare the social adjustment of chronics with that of non-psychotics and chronic medically ill patients. The self-report Social Adjustment Scale used in this study was reconstructed by reference to Social Adjustment Scale- n , originally developed by Schooler et al. to assess the social adjustment of chronic schizophrenics. The reconstructed and modified self-report Social Adjustment Scale was administered to psychiatric outpatients including chronic schizophrenics non-psychotic patients and inpatients who were suffered from chronic medical disease for at least 6 months. The results and conclusions are as follows; 1) The result showed the best social adjustment in the area of parental role and the poorest adjustment in the area of sexual adjustment in the chronic schizophrenic group. 2) In chronic schizophrenic group, the overall social adjustment was poorer than in chronic medically ill group, but there was no significant difference between chronic schizophrenic group and non-psychotic patients group. 3) Considering role function between chronic schizophrenic patients group and non-psychotic patients group showed poorer adjustment than chronic medically ill patients in the area of marital adjustment and role performance in the extended family. 4) There was no significant difference between chronic schizophrenic group and non-psychotic patients group as to social adjustment. This result may show th at chronic psychiatric patients, regardless of its diagnosis, suffer from social and vocational dysfunction.