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The reliability of foreign language textbooks is generally reflected in three aspects, the true situation, the natural language and the variety of materials. This research focused on the naturalness of the language, using two corpus which were created by the author directly. Firstly, it had calculated the confidence interval of the full morpheme's categorical usage which is in the annotated corpus of using in oral Korean morpheme in the interval estimation methods in statistics. Then, setting morphological annotated corpus in Korean listening textbooks as the object, examined the difference between the diametrical appearance rate of real morphemes which in each textbook and the categorical utilization's confidence interval of oral Korean. The result of the comparison is that Korean listening textbooks which were published in China had some differences with real oral Korean in terms of categorical morphemes of full morphemes. The utilization of proper nouns, nouns, adjectives, verbs, auxiliary verbs, pre-nouns, conjunctive adverbs was higher than that in the oral Korean, but the utilization of pronouns, numerals, verbs, negative copular, proper adverbs, interjections was lower than the oral Korean. Therefore, because of the purpose of the dialogues which in Korean listening textbooks is for educational, we should not focus only on grammatical item or the amount of vocabulary, but provide plenty of opportunities that learners can access to natural conversations which are close to real life and adjust on the actual characteristics of the oral Korean. We should satisfy that the Korean learners' learning needs as much as possible.