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The study, with years of writing materials by the Chinese Korean learners from primary to advanced levels as the research material, keeps records of the diachronic changes of their vocabulary-use pattern. And it investigates the vocabulary-pattern conversion by the Korean learners in each semester and finally proves that by studying their vocabulary -pattern conversion, we can conclude that the Korean learners’inter -language follows a specific and regular pattern. The subjects investigated are the Korean majors from Chinese undergraduate universities. The study aims to focus on the learners’ inter-language in a diachronic way. And through the analysis of the use of primary, intermediate and advanced vocabulary and the vocabulary-pattern conversion in their writing materials of the final examination from the primary to the advanced levels(from the 2ndto6thsemesters),it explains clearly the vocabulary pattern conversion can reflect the development and change of the interlanguage of the Korean learners.