韓元震（1682-1751）由「氣」見「理」，以「氣」論「心」，立場鮮明，為栗谷學派後起健將，與同門李柬（1677-1727）針對「人物性同異」問題，產生相異的見解，往復辯論，形成朝鮮後期一場重要的學術論爭，稱為「湖洛論爭」或是「湖洛是非」。事實上，韓氏撰有《朱子言論同異考》，全書六卷，共計三十九門，並附以《論孟輯註或問》，由義理而及於經解，乃至於史傳文字等，朱熹學術無不涉及，牽涉既廣，體系龐大，本文以《大學》、《中庸》為範圍，考察韓元震於朱熹書信、語錄、經解文字當中，分析相歧說法，以定朱熹學術究竟，細節之間，得見朱熹反覆錘鍊，一生思索的歷程，從而在後人以朱證朱的詮釋方式當中，甚至援朱以附陸的情況下，引導回歸於朱熹學術思考正途，在理學、心學之分，漢學、宋學之辨，門戶歧出當中，得以樹立朝鮮學術主體地位，對於朱學詮釋也具有推進作用。

Han Won-Jin (1682-1751), an outstanding scholar of Yulgok School, learned ＂principle (li)＂ from ＂material-force (qi)＂ and then interpreted ＂mind (xin)＂ base on ＂principle.＂ He had clear theoretical standpoint and argued the issue titled ＂Sameness or Differences between Human Nature and Animal Nature＂ with his fellow, Lee Gan (1677-1727). Their arguments formed Huluo Debate, an important academic discussion in Korea. In fact, through investigating the ordinance of Confucianism, annotations on classics, and historical texts, Han composed Survey of the Sameness and Differences of Zhu Xi's Discourses (Zhuzi yanlun tongyikao). There are six volumes and thirty-nine categories in this book, which is also attached Questions on Annotations of Analects of Confucius and Mencius (Lunmeng zhangju huowen). Since the system of Zhu Xi's doctrine is very extensive, I take Great Learning (Daxue) and Doctrine of the Mean (Zhongyong) as the surveying range to analyze Han Yuanzhen's explanations of Zhu Xi's letters, dicta, and annotations on classics. In this paper, I will clarify Zhu Xi's academic achievement and lifelong thinking process according to the interpretations of researchers of Zhu Xi's works, who proved Zhu's ideas through Zhu's own discourses or even quoted Zhu's words to compare with Lu Jiuyuan's explanations. Their careful studies, which distinguish between Philosophy of Principle (lixue) and Philosophy of Mind (xinxue), as well as Han School and Song School, help readers to understand Zhu Xi's thought correctly. They not only established the subject of Zhu's study in Korea but also carried forward Zhu's study unceasingly.