This paper aims to examine Emperor Gojong's Diplomatic Protocol. The paper's main data is Yesik-jangjeong, Ceremony Constitution, published in 1902. Chosŏn Government had started to make the modern diplomatic relation with Japan in 1876. After then, the Government needed to have new diplomatic protocol suitable for the new situation. But the course of arranging the new protocol wasn't so easy. When Chosŏn Kingdom changed Great Han Empire, the Government should make new national protocol. Emperor Gojong's diplomatic protocol is similar to that of friendly relationship with neighbor countries in Chosŏn Dynasty. It was the same on the point that the host, king or emperor, received the sovereign’s message with taking the Royal seat on the center of the royal palace. But when the diplomat presenting the sovereign’s message made a bow to Emperor Gojong, Gojong should answer the salute standing in front of the seat. This ceremony symbolized the two countries exchanging the sovereign’s message were on the equal position. When Great Han Empire Government made the modern diplomatic protocol, the Government investigated the European country's protocol. Particularly the United States’ diplomatic ceremony which Han Emperor's diplomatic minister experienced was very useful. Ceremony Constitution had been practiced in best days of Great Han Empire. But the Empire lost the right of a diplomatic negotiations in 1905, the diplomatic offices abroad were closed and the foreign diplomatic offices in Seoul were removed too. After then Yesik-won, Board of Ceremony, was closed in 1906, it means there remained no country practicing the diplomatic protocol on Ceremony Constitution.