Kim Jun’s political power(金俊政權) that started on November 1258, checked the 5th Mongol invader’s advance, performing aggressive battles against Mongol, and succeeded in restraining the claim that must surrender to the Mongol instantly. But Kim Jun had difficulty in accomplishing the war against Mongol continuously, because of exhaustion of the finance in 30 years war against Mongol. And Juhyunmin(州縣民)’s collective surrender to Mongol army made public opinion of the Court worse. Therefore Kim Jun dispatched the Goryeo envoy, general Park Hi-sil(朴希實) and Cho Mun-ju(趙文柱) who were the origin of 3 crack units(Sambyeolcho：三別抄) to Mongol, and concluded a conditional peace negotiations with Mongol Emperor, Heonjong(憲宗) Monke. So called ‘a conditional peace negotiations with Mongol(條件附 對蒙講和)’ was composed of two conditioned stipulations. The first, if Goryeo dynasty carry out attendance of the crown prince at the Royal Court of Mongol empire, Mongol army will withdraw in the Bukgye(北界). The second, if Goryeo dynasty finish repair work that reconstruct Kyegyung(開京), to be confined to 3 years, Kangdo(江都) Court must fulfill landing and returning to the capital(出陸還都). This conditional peace negotiations saved Kim Jun’s political power in the crisis of the war against Mongol. Also, under this negotiation, Kim Jun could delay landing and returning to the capital. Furthermore, he could utilize brinkmanship toward Mongol and work out a scheme that grasp political power for the long time. After conclusion of a conditional peace negotiations with Mongol, Kim Jun tried to enthrone Ankyungkong(安慶公) Wang Chang(王倎) to the king for the next term, instead of the crown prince Wang Jeon(王倎) who may stick to Mongol. But civilians of Jaechu(宰樞) prevented Kim Jun’s plan. They claimed to uphold the wish of Kojong(高宗) and decided to protect the crown prince. One step more advanced, they prohibited vigorously Kim Jun’s plan, because of fear over reinvasion of Mongol army. Finally, Kim Jun’s political power accepted to the opinion of Jaechu, and recognized the crown prince Wang Jeon as the king of Goryeo dynasty. Through this political reaction, Kim Jun could maintain his political power.