The aim of this thesis is briefly to study the three Iban documents of the Buddhist temple Sangwonsa, which is located in Pyungchang(平昌) of Gangwondo(江原道). Those documents were written in Idu(史讀) in the latter half of the 15C. In this thesis, they were translated in Modern Korean, and Idu scripts were as well underlined and read according to the presumed pronunciation. The first and the second document of those threes were respectively in 1469 and 1477 by the provincial government Gangneung-daedohobu(江陵大都護府), and the third was made by Naesusa(內需司) in 1481. The purpose of the first document was to donate the land Sansanjeeon(蒜山堤堰) to Sangwonsa and to make Sangwonsa be free of various taxes and obligatory labors. In the second and the third document, the relationship of the two Buddhist temples, Sangwonsa and Naksansa(洛山寺), was mentioned. The relationship between the Sangwonsa and royal household began when King Taejo designated it as his Wondchal(願刹, prayer temples). In the early Chosun Dynasty, the Taxation Article and slaves were given to the temples which had relations with royal household. In the King Taejong era, when the temples and their slaves were forfeited, the Sangwonsa was exempt from forfeit. Thereafter also in the 6th year of King Sejong, only Gwan-eum-gul(觀音窟) and Jin-gwan-sa(津寬寺) were designated Su-ryuk-sa(水陸社) as well as Sangwonsa and Gyun-am-sa(見庵寺). Some time later the Taxation Article of Gyung-bok-sa(景福寺) in Jeonju was included in Sangwonsa. The temple land and Guk-haeng-su-ryuk-jeon(國行水陸田) were given as the Taxation Article of Sangwonsa. The Sangwonsa was possessed the private land besides the land of Taxation Article(收租地). It got to know from the fact that the King Sejo gave Buddhist priest Sinmi(信眉) long-time uncultivated San-San-je-eon(蒜山堤堰) one year after a Buddhist lecture meeting of regeneration and completion of a building in Sangwonsa. But it was written that in the first year of King Yejong the San-San-je-eon was given to the Sangwonsa again. The royal gift in the King Yejong period was understood as the reconfirmation of the gift in the King Sejo period. After that Sinmi gave the San-San-je-eon to his disciple Hakyeol(學說), who used to take away Minjeon(民田, people`s land) around the je-eon claiming it as a reclaimed land. Special privilege to the Sangwonsa was not limited only to land. Naesusa(內需司) slavery privillege, various kinds of public works(諸雜役), labor service(요역) and salt tax(鹽盆稅) belonging to the temple were exempted. Labor service in early Chousun Dynasty was thoroughly imposed according to the land, but most of the temples related to royal household including Sangwonsa were exempted from labor service by the king. Exemption of labor service was the critical reason of increasing the temple`s private lands. Because of this at the time Sangwonsa was widely taking possession of lands, also in spite of prohibition of giving lands to temple, the temple`s private lands increased a lot. Sangwonsa was operated by Jang-ri(長利, an annul interest of fifty percent) and by Bangnap(防納, payment by proxy) behavior. Hakyeol made provincial governors to distribute cotton cloth(綿布) to the public compulsorily. The Public was charged 2seok(石) 5doo(斗) for 1pil(匹) of cotton cloth. Those who could not pay back within the due data were charged interest. This interest imposed by Hakyeol was a kind of Beondong(反同), taking high interest after lending rice and cloth to the public compulsorily since the Koryo Dynasty. Naksansa was Wonchal builded for luck with money of son(later king Yejong). After King Sejo designated Naksansa as his son`s Wonchal, he gave rice and cotton cloth as almgiving, and he allowed monks to cultivate 30seok fertile lands near Naksan. During King SeongJong`s reign, he granted 200kyeol the Taxation Article of Sam-ga-jeon(三嘉田), Eu Eui-ryeong-jeon(宜令田) and Cheong-do-jeon(淸道田) in Gyeongsang Province to th