The purpose of this study was to search the theoretical foundation of vocational-interpersonal skills, the characteristics of job-related interpersonal skills of mentally retarded individuals, the social situation, the contents and methods of interpersonal skills training through the analyzing the previous studies related vocational-interpersonal skills. And then based on the these results, this study try to find the instructional implication for training job-related interpersonal skills to mentally retarded individuals in order to improve interpersonal ability. The results of analyzing the previous studies are as follows. First, we should develop interpersonal skills considering the various abilities of mentally retarded individuals. Second, we should improve the interpersonal ability about the relationship with co-works and supervisor in employment. Third, the place and the social situation of the interpersonal skills training have to be chosen for improving the effectiveness of generalization and maintenance. Forth, the contents and methods of training should be composed of the things that are acceptable to mentally retarded individuals.