Abstract: Conceptually， there was a special significance to the connection between the “Chongde Ｒeformation”in 1636 and the subsequent battle between the Qing Dynasty and Joseon Korea，known as “the second Manchu invasion of Korea． ”From the view point of Joseon Korea， the “Chongde Ｒeformation”reflected the Qing’s desire to replace the Ming Dynasty and involved the transformation of the world order． The legitimacy of the Qing’s claim was based on the idea that only a ruler with the highest moral standing had the qualification to be the world’s ruler． To prove this claim it was necessary to conquer Mongolia and Joseon Korea． In contrast with Mongolia，Joseon Korea’s submission to the Qing had special significance，which reinforced Hong Taiji’s moral image and deconstructed the legitimacy of Ming as the world ruler． Therefore，after the“Chongde Ｒeformation”，the primary task of the Qing became putting Joseon Korea in subjugation． Through the second Manchu invasion of Korea，Joseon Korea was incorporated into the political framework of the Qing Dynasty，but still did not admit the Qing’s legitimacy，which suggested that the Qing’s conquest did not completely achieve the expected result．