Abstract: After the battle of Fushun, the Ming government planer to launch a massive attack on the Jin government employing troops drafted in Korea. At the same time ,fearing an attack on two fronts, the Jin government pressured Korea not to join in the attack. This placed the Korean government in a very difficult position. In order to safeguard the national interest, the Korea was forced to enter the war, but at the same time the Korean government envoys secretly contacted the Jin government and reached a mutual understanding. This incident not only played an important role in the development of the political relationship between the Jin and the Korea, it also was an important historical stage in the development of Chinese –Korean relations.