In Jeongyu War occurring in 1597 because of Toyotomi Hideyoshi’s second invasion，Chinese official Ding Yingtai’s impeaching of Korean liege，Chinese generals in Korea and officials in Beijing had complicated and subtle meanings. Ding’s charge aroused strong reactions of Korean liege especially political fights，so Korean diplomatic corps were dispatched to Beijing in order to justify and defend. They made preparations and took action zealously，winning the final victory and achieving the goal. This diplomatic dispute was resulted from Ming Dynasty’s political fights and also was calmed down by Ming Dynasty’s political fights. It intensively showed both Sino-Korean interdependent political fights and each liege fights，revealed authority essence of Sino-Korean tributary relations，so it’s doubtful whether Sino-Korean tributary relations were stable in Ming Dynasty.