In Goryeo Dynasty establishment of a country early, Gaegyeong of National Capital and Seogyeong of Second Capital was coexisting as the Two Capital System. This status of Seogyeong was changed that it was built Donggyeong in Gyeongju. As a result, the Three Capital System was established. Gyeongju was upgraded a member of Three Capital because of inherited consciousness of Silla history and the political trends in Goryeo Dynasty. However, the Two Capital System was sustained since it was out of the patrol in the target from the stand after Seongjong period. The instrument in institutional system from formal system in the Three Capital System was changed that it was built Namgyeong in Yangzhou. Namgyeong was constructed for the purpose of Capital Relocation. It was meant that a one-side the patrol of Seogyeong was magnifying of Namgyeong. The symbol of National Capital was the National Castle. In other words, it was the Nasung of Gaegyeong. Also the Nasung of Seogyeong has been established before the Nasung of Gaegyeong, but it did not call the National Castle. The actual relationship of National Capital and Second Capital was the King's patrol. After Sukjong period, the patrol of Seogyeong and Namgyeong has been progressing steadily. The Three Capital System was complementary the historical limitations of Gaegyeong, but it did not complement the Gaegyeong in the crisis of foreign war. This was meant that the Three Capital System was more important the political purposes than the military purposes. Gaegyeong has become the National Capital as the birthplace of the ancestors. Nevertheless, the migration debate in new National Capital was raised consistently. The position of the National Capital was an important issue on systematic order of the land operations. Of course, the migration debate of new National Capital was all discarded except for the migration of Ganghwa in the war time of Mongolia. The reason is thought to have been derived from cyclic structure from the Two Capital System of Gaegyeong·Seogyeong and the Three Capital System of Gaegyeong·Seogyeong·Donggyeong. Thus, the Three Capital System of Goryeo Dynasty was a big influence on that it was the systematic operations of National land as well as the ups and downs of political forces.