This paper discussed about, how the modern Japanese Government established the Protection of Mounded tomb system through enactment of the law. The Modern Protection of Mounded tomb system was divided into three stages by the law. The following results were, 1. Formation Stage (1968_1894), this period begins with Meiji Restoration to the Sino-Japanese War. The Government prescribed the Tomb of the emperor, uncertain 13th Tomb of the emperor, and focus was Tombs of the emperor and imperial family system. 2. Development Stage (1895_1904), this period begins with the Sino-Japanese War to the Russo-Japanese War. The Tombs of the emperor and imperial family system had an effect on a campaign for the Preservation of Mounded tomb by Civilian research group, was begun to carry out another way. 3. Establishment Stage (1905_1919), this period begin with Russo-Japanese War to enacted Act of Preservation of Historic site, Scenic beauty and Natural monument, 1919. The Modern Protection of Mounded tomb system determined the new line, was effected by establishment of the Modern Emperor Nation system, raised Nationalism and imperialism. The Modern protection of Mounded tomb system had two-way government, Tombs of the emperor aud imperial family system and Scenic beauty system, until the Act of Protection of cultural property was established 1950. I declared that a number of the Tomb, out of government subject, was disregarded by the Imperial Household Agency, they were paid attention to only the Tombs of the emperor aud imperial family system.