This study aims to provide the quantitative criteria for selecting educational vocabularies needful to Korean language education for overseas adolescents, based on the observations of the index of overlap among vocabularies in textbooks(VinT) and the index of congruence between VinT and Korean basic vocabulary list. By a quantitative analysis, the conclusion reached is that the vocabularies about their school lives and everyday lives after school, the vocabularies related to Korean culture and history, and the vocabularies pertaining to local and national customs would be included in educational vocabularies for overseas adolescents, even though these vocabularies are not included in Korean basic vocabulary list. this study proposed newly 73 words that should be included in these categories. this study also provided a criterion to judge the importance of vocabulary, based on the index of overlap among vocabularies in textbooks. Furthermore, the results of this study can be meaningful as a fundamental datum in selecting vocabularies following a topic category. (Keimyung University)