In this article, the construction process was analyzed by dividing Wolseong, a royal castle of Silla, by construction section. By comparing Dodangsan Fortress and Namsan Fortress, it was intended to reveal the construction technology of Silla Wanggyeong. In addition, in order to see if the construction technology of the Wanggyeong Fortress was confirmed in other buildings, the exchange of fortification technology was reviewed by comparing tombs and embankments. Wolseong was analyzed by dividing it into a moat section, a west wall section, and a north wall section, and the preliminary survey of Japanese colonial era and the 2011 excavation survey were used as supplementary data. In view of the section of the west wall and the section of the north wall, it is believed that the built-up wall will be completed after the formation of the base → the central frame → three to four times of extending construction. The basic construction process was the same overall, but the three sections show the construction of the wall using different construction techniques and materials according to the base conditions. In addition, in the moat section and the west wall section, traces of repairs were found two to three times after the wall was built, and the outer wall or inner wall was partially supplemented according to the maintenance situation. As Dodangsan Fortress and Namsan Fortress were built in a way that made hills → built slopes, a different construction technology from Wolseong Fortress was identified. Both fortresses were constructed with a construction method suitable for small-scale earthen fortifications, and as it is estimated to be a political space and a government building, it can be seen that they were efficiently built according to the purpose of construction. On the other hand, although Silla’s stone-mounded wooden chamber was built at the same time, the similarity of fortification technology was captured only in the Hoseok structure, where the functional sector was emphasized, and various construction techniques were shared for each construction process in the embankment.
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