The present study aims to classify the types of verb conjugation errors of beginning learners and identify their factors through the analysis of an error-annotated learner corpus. As a result of reviewing Korean textbooks and prior studies, the description and explanation for criteria of verb conjugation has limitations to cover the various types of errors seen by learners. In this study, we analyze errors of beginning learners in the error-annotated learner corpus and classified them into four types according to the factor of errors: analogy towards base form, analogy towards verb form, analogy towards vowel-ending form, and addition/deletion of ㄹ. Throughout these errors, the dominant mechanism is ‘analogy’, which is that forms with high frequency affect other forms as they have a strong lexical strength. The results of this study may provide a basis for educational methods that enables learners to learn the points of verb conjugation that they actually struggle with.(Yonsei University)