The purpose of the study is to develop a curriculum for the librarian assistant task and to investigate the effect of application of it to the high school students with intellectual disabilities. Four high school students who were attending at the special class of high schools of Chungnam province participated in this study for eight months. The curriculum for librarian assistant tasks has been developed in consideration of the developmental disabilities characteristics, review of previous research, vocational basic competency and professional competency suggested by National Competency Standards(NCS). The vocational basic competency is classified with basic technical skills and common technical skills and is developed into eight domains in this study. The basic technical skills were classified into 4 domains and divided into eight sub-domains, and were implemented for 26 weeks(320 hours)-curriculum. The results of the study are as follows: Firstly, the performance of the participants was improved in book-array performance of librarian assistants task, secondly, the educational performance by the individual educational plan was also improved in 5 sub-domains, and thirdly, four of the participants(75%) were employed in elementary school libraries and in a public library. These results shows that the developed librarian assistant curriculum is proper librarian assistants educational curriculum for the students with developmental disabilities.