There is a Buddhist gong that is hanging in Dongnakwon of Guryongsa temple located in Wongju city, Gangwon-do. This Buddhist gong belongs to the second type of late Joseon period due to have two ridgelines on the front and the sides. In addition this Buddhist gong has six sankrit character ‘ (oṃ)’. The oldest Buddhist gong with Sanskrit characters which was made during late Joseon period is the Buddhist gong made in 1666 with inscription ‘the Kangxi 5th Year of Jangcheonsa temple, in which the five Sanskrit characters of “oṃ ma ṇi pad me” were arranged in the form of a pentagon. But coming to the state the Buddhist gong made in 1770 with inscription ’Qianlong 35 year of Neunggasa temple, four Sanskrit characters of oṃ was changed into a rhombus form. In the Buddhist gong made in 1837 with inscription ’Daogwang 17 year, six Sanskrit character of oṃ was changed into a hexagonal form. The oldest Buddhist gong with six Sanskrit characters was made in 1837 with inscription ‘Dogwang 17th Year’, however, this Buddhist gong was lost. The manufacturing time of the Buddhist gong with the six Sanskrit characters can be set as the lower limit based on the Buddhist gong with inscription Daogwang 17th Year. However, the type of the Buddhist gong of Guryongsa temple belongs to the second type Buddhist gong of the late Joseon Dynasty, and the seconf type Buddhist gongs were mainly produced in the 18th century. Referring to the Buddhist gong of Sokcho Sinheungsa temple made in 1788, although that of Guryongsa temple had no inscriptions that could know the manufacturing time, it appears that the Buddhist gong with six Sanskrit characters prior to the Buddhist gong with inscription Daogwang 17th Year made by Kim Jong-deuk in 1837 was produced in the late 18th century.