The thesis deals with the transition stages of the bronze mirror's origin and technical transition process. For a long time, the bronze mirror was regarded as one of the Bronze Age's representative artifacts, symbolizing the shaman's armory or the chief priest's power. However, the state of the bronze mirror and the corpse's identity in which it was found, between the Qijia Culture to the Western Chou Dynasty, show that the bronze mirror was not the property of a the powerful authority figure or chief priest. Also, an extremely small amount was discovered which means that it was not an item used commonly, but used only when a high rank person dies and the mirror is buried with the corpse therefore can be thought of as burial-use artifact. A steep expansion occurs during the Spring and Autumn Period and the Warring States Period. Unlike the Shang Dynasty or Western Chou Dynasty where the government monopolistically supplied and controlled the bronze and tin, the mineral resources were developed all over the country and the each region's own political authority was able to effectively manage the resources. Therefore, large quantities of Ta-new type mirror started to appear in China's northeast region and this is an important proof of Gojoseon political group's growth and proliferation. In China's early stages of the bronze mirror, it was used as a decorative burial item. Oppositely, Ta-new type bronze mirror was a symbol of the sun and the moon and through geometrical patterns it represented the country's government ranks in theearly states. It also connected the entire country as one; therefore the bronze mirror can be seen as the representative relic of the Gojoseon period.