I study the establishing and thinking way and trend of Namsungsanmun and Euicheon`s pupils` footstep on the basis of Daegak national master`s epitaph. Moreover, we explore the character and status of the students from Zen-Sect. Euicheon built Tientai-Sect on the union of Beoban-Sect and Zen-Sect through the Buddhist integration movement. After his death, Zen-Sect was the root of Namsungsanmun. In this process Gyoeung and Deogso played the key role. So Namsungsanmun is different from 5 Muns in Tientai-Sect. The Namsungsanmun`s idea is refering to Gyoeung, Deogso, his followers and Jigyeom. This Mun`s ideational soil is in Beobhwa-reciting-belief(法華講經信仰), Sutra-meditation-combining(敎禪兼學), and Zen. Euicheon`s cohesion-thought is in Namsungsanmun. After Gyoeung, the Mun strengthened the power by Deogso`s job to recommodate Tientai-Sect`s officials. Thereafter, Choi`s reign weakened the Mun`s prestige. But in Mongol Yuan Empire it was recovered. We can`t find the thinking line between Baekryeon-Association and Namsungsanmun in the data. But until Jeongo`s revival, Namsungsanmun was kept.