Keykubadiye Palace, one of the most important palaces of the Anatolian Seljuk period, is located in the east side of Keykubad (Şeker) Lake in Kayseri, in the territory of Kayseri Sugar Factory. Although the exact date of its construction is not known, it is understood from the sources of that period that it was built in the mid-1220s by Alaeddin Keykubad the first. The palace which is also stated as ''Keykubadiye'' was dealt with the continuation of the sentence, taking place in the text of İbn Bibi, ''... God created heaven to show it in the world'' full of praises. Unfortunately, despite these praises, the life of the palace wasn't too long. After Keykubad, in the period of his son Gıyaseddin Keyhüsrev the second, the palace was used for a while, after the battle of Kösedağ in 1243, during the invasion of Kayseri by the Mongols, it was burned and broken down. Kerimüddin Mahmud from Aksaray stated that Keykubadiye was no longer in use in 1265. After this process, the name of the palace is no longer encountered in historical sources. From the palace, the ruins of two greatly damaged buildings have reached to the present. One of them is the Four Arched Building (the Little Pavilion) and the other is the Vaulted Structure (the Big Pavilion). Keykubadiye Palace was discovered by Zeki Oral in 1953 and introduced to the realm of science. Prof. Dr. Oktay Aslanapa, in his short-term excavation in 1964, tried to uncover the surrounding area of the ruins existing today and he also carried out studies in the construction which he named as three vaulted structure and isn't available today at the edge of the lake in the north. In the framework of the data emerged here, he named the structure as the Little Pavilion and he stated that the seven sliced stone in front of it could be associated with a balcony or pier. In 1980, also a short- term excavation was realized by Prof. Dr. Oluş Arık and Prof. Dr. Rüçhan Arık, this study also could not be continued for some reasons. In 2014, drilling and cleaning works were carried out between 07.04.2014 and 17.04.2014 in the ruins called Four Arched Building and Vaulted Structure under the scientific consultancy of Prof. Dr. Ali Baş. During this study, important cultural assets were unearthed. Therefore, an application was made to the Ministry of Culture and Tourism in 2014, with the approval of the Council of Ministers, excavations were started under the presidency of Prof. Dr. Ali Baş in 2015 and the fourth season of the excavation was realized in 2018. In this article, the Keykubadiye Palace is evaluated especially in the light of the excavations with the help of the references of Seljuk period and the discovery of the palace.