The purpose of this paper is to analyze the usage patterns and productive word-formation units of complex words appeared in the Korean educational materials. This study considers the linkage with the Korean education curriculum based on analysis of vocabulary appeared in the Test of Proficiency in Korean (TOPIK) materials and Korean Language Corpus (KTC). In addition, this study is based on the vocabulary frequency analysis of the general Korean by the National Institute of the Korean Language (2002) and 강범모 etc (2009). Specific results of this study are as follows. First, this study analyzes the aspects of complex words in the Korean educational materials. Specifically, this study examines the degree of overlap among complex words across the Korean materials and provides the list of complex words with higher frequency by analyzing the distribution of complex words by part of speech. Second, this study analyzes the word-formation units(affix for derivatives and word-root for compound words) constituting the complex words and finds the order of word-formation units with a high word-forming capability. Third, this study provides the characteristics of semi-complex words appeared in the Korean educational materials. (Yonsei University)