Abstract: The Southern Song Dynasty scholar Lin Xiyi(1193 -- 1271) publicly commented on the books of heresy such as Laozi, Zhuangzi, and Liezi(collectively referred to as the sanzi), and the opening of the three religions reached an unprecedented scale..The "pre-understanding" emphasized by Qiedamoer is very effective in exploring the "heresy" view of Linxiyi's sanzi. He proposed that the science scientist misunderstood the sanzi because of the "pre-understanding" of the "Confucian orthodoxy," but he himself also had a "pre-understanding" of the "three religions" and used it as a "positive name" for the sanzi heresy. The main interpretation strategies include: For the same words that appear in the text of the sanzi and the Confucianism, the "meaning of the word and the difference in the language" are proposed, and the interpretation strategy of the sanzi is understood in the sanzi; The text facts of the Confucian saints in the sanzi are widely used, and the writing characteristics of the "excessive" of the sanzi are pointed out and the "eyes" are required to know their "true meaning"; For the sanzi (including Buddhism), which is often criticized by the scientists, they do not study and abandon the world. They find specific evidence from the text to prove that the sanzi (including Buddhism) is the same as Confucianism. As for the sanzi can not really communicate with the Confucianism, Lin Xiyi said that it is necessary to understand the meaning of such words. Through Lin Xiyi, we can further understand the overall trend of the three thoughts of Confucianism, Taoism and Buddhism in the Southern Song Dynasty.

Key words: Lin Xiyi, Sanzi, Heresies, "Before understanding", Three religions integration