The purpose of this research is to better understand the Dongmyo, the Eastern Shrine of GuanYu and the military costumes of the Joseon period andto develop different cultural contents. By studying relevant literature, confirmations were made about the various types of costumes and their historical changes. During the reign of King Yeongjo, the ceremonial conductors often wore armors, and the king wore a different military costume. During the reign of King Jeongjo thereafter, the ceremonial costumes were codified in the book, the Chun-gwan tonggo(General Outline for the Ministry of Rites), along with the costumes for the musicians and lower officials. However, the military features were weakened in the late Imperial Joseon years. In terms of costumes, it would be best today to restore the ceremonies of the Shrine of Guan Yu during the period of King Jeongjo. All the costumes for different figures of the Shrine are clearly confirmed, and by emphasizing the main features of the ceremonials of the Shrine, it is possible to differentiate the ceremony from other restoration activities in Korea. For the Guan Yu statue, the hat is square shaped and decorated with nine bead strings, it is dressed with a red dragon coat and a violet inner coat. This study presents methods for the restorations of the original costumes for the individual figures of the ceremonials, with necessary theoretical explanations. The king wears the lamella gold armor, while different ceremonial officials wear differentiated armors according to their different ranks. All the civil and military officials who attend the ceremony wear military clothes with horse`s mane hats and swords. The musical conductor and directors are expected in armors and participating musicians also have to wear armors according to the Akhak Gwebeom (Basics of Music).