Objectives The purpose of this study is to analyze the colloquial presentation corpus of Korean learners for academic purposes to reveal stylistic characteristics and to find out the correlation between the use of academic styles according to proficiency. Methods 69 academic learners in Korean universities or graduate schools recorded and transcribed presentations to build researcher’s own corpus of learner colloquial presentations, and analyzed high-frequency word segment and high-frequency expression sentences using AntConc corpus analysis programs. Results The purposes of this study were to specify variables related to convergence competency, and to analyze the structural relationships among them. The purposes of this study were to specify variables related to convergence competency, and to analyze the structural relationships among them. Conclusions Through this study, it can be seen that learners for academic purposes are not fully aware of the grammar and expressions strategically used by native Korean speakers in presenting academic purposes and are not effectively used. In addition, it was found that the academic style characteristics were influenced by the genre of presentation rather than the difference according to the degree of mastery. Therefore, in Korean language education for learners for academic purposes, it is necessary to understand the academic nature of the presentation of academic purposes and to appropriately and effectively use a style that reveals academic specificity according to the academic level or purpose.