This Essay analyzed Koryo chancellors in the period of rule by the Ch`oe House in the first half of the 13th century. At that time, the Chancellors were about 20 that included 8～9 Jinjae(眞宰 or 省宰), 1～2 Bokya(僕射) like Susagong(守司空) and 8～9 Chumil(樞密) of Chumilwon(樞密院). It checked out the identities of 86 Chumil under Dongjichumilwonsa(同知樞密院事) as the ground of the Jinjae to observation their family background after make out the list of chancellors. According to the family background, they were 29 descendants of minister, 18 descendants of government official, 6 descendants of Hyangri (鄕吏) and 33 the indistinct. And according to the way that became a member of government official, they included 28 successful candidates of Jesuleop(製述業), 12 from Eumseo(蔭敍), 29 military nobilities and 17 the indistinct. Also, causes of their promotion were writing ability(6), merit rating(18), distinguished war services(7), relation with the most powerful man(10) and indistinctness(45). And there are so many chancellors from military nobilities because of the riot of the people and the invasion of the different ethnic group in the period of rule by the Choe. But there is very little difference between their family and their predecessors. The rulers of the Choe could not establish an independent government. Formally, they ruled over Koryo by approval of king as a prime minister. Also, they retained power by liquidating his opponents. For this, they reflected their political will through Gyojeongdogam(敎定都監), the power base of military nobilities. But they did not reform the system of the 3 Seong(省) 6 Bu(部).