In this study, the Chinese-style belt ornament found distributed throughout East Asia was analyzed and its development process and significance reviewed. The Chinese-style belt ornament can be classified into a total of eight types by combining form and manufacturing technology, and each type is divided into four stages which lasted from the end of the third century to the middle of the fourth century. The Chinese-style belt ornament was formed by combining the elements of belt ornaments, including those decorated with horse-hoof-shaped patterns in repousse, which existed from Later Han to Three Kingdoms. It is believed to have been intentionally created in the Western Jin Dynasty, which achieved unification. From that time onwards, the Chinese- style belt ornament, which was actively produced, spread not only throughout China’s Central Region but also to Northeastern China, the Korean Peninsula, and the Japanese Archipelago. Produced within the territories of the Western Jin Dynasty and the Eastern Jin Dynasty, the Chinese-style belt ornament was imitated by the sixteen kingdoms, such as Former Qin and Former Yan. In the Korean Peninsula and the Japanese Archipelago, where Chinese- style belts were introduced, an independent culture of belt-ornaments developed. The highly standardized Chinese-style belt ornament, which lacked significant difference in shape, was transferred or imitated with different meanings from region to region and had a great impact on the Three Kingdoms and the belt-ornament culture of Japan. This is the essential significance of the Chinese-style belt-ornament in East Asia.