The purpose of this study was to test a construct validity of the Social Stigma of Mental Illness Patients(SSMIP) Scale by cross-validation and to develope its norm. For this study, two field survey were administrated at July and October in 2002. In 1st survey, data were collected from 218 subjects for exploratory factor analysis of the SSMIP Scale. As a result, 3 factors were identified: ① un-recoverbility ② peril ③ visibility. In 2nd survey, data were collected from 561 subjects that was almost similar to those of 1st survey with same questionnaire. These data were analyzed for cross-validation of the SSMIP Scale. As a result, same 3 factors as the exploratory factor analysis were found. And the Cronbach's Alpha coefficients of total scale, un-recoverbility scale, peril scale, and visibility scales were .803, .776, .635 and .611. In order to diagnosis and predict discriminative behaviors toward the people with mental illness using the SSMIP Scale, coefficients of concurrent validity were calculated between score of the SSMIP Scale and discriminative behaviors. the coefficients of concurrent validity of the SSMIP Scale was .535(p<.05). As a norm of the SSMIP Scale, T-score was established to interpretate the score. Finally, discussed results and tasks of the future study according to limits of this study.