As it became clear through the point of argument, Morgolian regime advanced into China and couldn't avoid the Chinese reign. Mongolian regime had not experience in Chinese reign and appointed persons from Kitan, Jurchen and Balhae, who had much experience in Chinese reign to the bureaucracy on a large scale. These bureaucracies of different race dwelt in China a long time to assimilate in Chinese learning and were Chinesenized. Therefore they reigned Chinese, but the reign plan was different from the situation of Mongol. But Mongolian regime adhered Mongolian nomadic national spirit, the bureaucracies of different race couldn't accomplished the Chinesenization of Mongol. Eventually they were utilized in the technical point of Chinese reign. Here we observed that the policy of Chineseinzation reached limit. As the permanent reign race do not exist historically, Jurchen who had received the reign of Kitan established Kin Dynasty(金朝), their nation-state, on the contrary this Dynasty destroyed Liao Dynasty that Kitan had established, at the same time reigned Kitan. Kin Dynasty's fall, integrated the divided tribes. This time Kitan race took pains to accomplish the national desire which was the reconstruction or destroyed Liao. Then Ya Yul Ryu Ga(耶律留哥), a Kitan bureaucracy who knew the real condition of Mongol as north border CHEON HO(北邊千戶) of Kin Dynasty, deserted the national desire of all Kitan and surrendered to Jinggis Khan. After all he charged a part to make be smooth Manchuria occupation of Mongol. Of course most of Kitan opposed an intimating Mongolline of Ya Yul Ryu Ga. Kitan race met a good chance of Kin Dynasty's fall, if they were subordinated to Mongol, they judged that the reconstruction of destroyed Lao can't be accomplished and opposed it. After the surrender of Ya Yul Ryu Ga, powerful Kitan leaded wondering peoples and submitted to Mongol according to their judgement, or guided Mongol troops who invaded Kin Dynasty. Preferably they cooperated Mongol troops positively and make be smooth the invasion so much. So this, the leader of Kitan desired the reconstruction of destroyed Liao, and believed Mongol troops as a liberation army, preferably Mongol judged Kitan's cooperation as lubrication of invasion. The opposition of Kitan to intimating Mongol line of Ya Yul Ryu Ga is analyzed as repulsion to the Kitan view of Mongol. After all the reconstruction desire failed without result. Ya Yul Ryu Ga was a person of Kitan leaders, but all Kitan didn't follow him Therefore the reconstruction desire of destroyed Liao failed, it derived from the dissolution of leaders. Since of the establishment of Liao, the person who occupied the highest authority on the learning ability was Ya Yul Cho Jae(耶律楚材), Dong Lan King's(東丹王 8) generation, he was a man of established reputation of a series of biographies of 『Yuan Sa (元史)』, the educated. class including him didn't participate in the reconstruction movement of destroyed Liao, it is analyzed as the cause of failure of the reconstruction movement. Ya Yul Cho Jae was a self conceited person as believer or supporter to Chinese culture, had great interest about Chinesenization of Mongolian regime only, and didn't feel interest about the reconstruction movement of Kitan actually. As this Mongolian regime confirmed the national disruption of Kitan and regarded Kitan as a helper. Accordingly the leader of Kitan was Ya Yul Ryu Ga who controled six hundred thousand persons and Jinggis Khan faced him merely. Since of Kin Dynasty's establishment due to the invasion of Jinggis Khan, Kin Dynasty met the longest national critical moment, and dispatched an envoy who was proficient in Mongolian language and make feel a real condition of this land directly. But the envoys notified Mongol that the fall of Kin Dynasty approached or promised the surrender and took anti Kinic action individually. Not only but the bureaucracies from Kitan instigated Mongol troops to invasion or incited it. Tae Jo(太祖) and Tae Jong(太宗) advanced into China and accepted Ya Yul Cho Jae's state policy to be based in the traditional humanism and memorialize, the management to north China achieved success. Two emperors estimated that this success resulted from his devotional action, Chinesenization of Mongol didn't achieve success because of stubborn resistance of Mongolian bureaucracy. We can observe that the appointment of bureaucracy from Kitan reached limit. Generally the descendants of Dong Lan King including Ya Yul Cho Jae obtained a large reputation in scholarship and virtue, it is in touch with that family line, other bureaucracies from Kitan didn't depart from it. Then since of fall of South Sung, we saw the political aspect of bureaucracy from Kitan, it was finished as a good public official. This is analyzed that Mongol regime reduced the appointment of bureaucracy from Kitan, and Kitan were appointed as bureaucracy in restricted field. As this, the appointment of bureaucracy from Kitan was reduced, but the appointment of bureaucracy from Jurchen began to become serious from unenthronement time of Sejo, Kin Dynasty shared border with South Sung and Jurchen grasped the actual state of this land correctly, and Mongolian regime appointed this Jurchen bureaucracies on a large scale newly.