The "Historic city Preservative law" was legislated for the preservation of cultural properties and enacting regulations of managing the environment around them in 2004. This law was revised to "Historic city Preservative and Development law" in 2012, and specified the criteria for permissible behaviors in the preservative district. Therefore, this paper focused on the ancient capital Gyeongju and developed a comprehensive system for evaluating the value of the ancient historic district based on Analytic Hierarchy Process (AHP). Through the evaluation of the ancient historic districts, which are the pilot project districts in the "Gyeongju Ancient Capital Preservation Plan", some preferential projects were objectively proposed. As a result, according to the evaluation among 10 ancient historic districts in Gyeongju, Daereungwon got a score of 78.34, which is the highest among 7 special preservation districts. On the other side, the Gyo-dong area got a score of 76.14, the highest among 3 historic and cultural environmental districts. Finally, for the preservation and development of Gyeongju, some efficient preservation and development plans were objectively proposed for the pilot project districts in the "Gyeongju Ancient Capital Preservation Plan".