Abstract: The historical writing of Bazhalawarmi, the last Prince Liang of Yunnan, underwent a distinct phased evolution during the Ming and Qing dynasties. Most documents of the Ming Dynasty referred to him as a “Remnant of the Yuan Dynasty”, while historical materials of the Qing Dynasty reshaped his image into a “Loyal Prince”.By systematically sorting through materials such as official documents, privately compiled historical works, and local gazetteers from the two dynasties, it can be observed that the portrayal of Prince Liang in historical writing underwent a shift: from “the orphaned descendant of the Yuan Emperor” to “a Remnant of the Yuan Dynasty”, and finally to “a Loyal Prince”. This process was closely intertwined with the evolution of the concept of “Legitimacy” in the Ming and Qing periods.The negative portrayal of Prince Liang in the Ming Dynasty not only served to justify the legitimacy of its military campaigns against him but also reflected the dynasty's true stance on the legitimacy of the Yuan Dynasty, under the influence of the ideology of “distinguishing between Hua(the Han Chinese) and Yi(ethnic minorities)”. In contrast, against the backdrop of the Qing Dynasty's systematic reconstruction of the “Legitimacy” discourse to consolidate its own legitimacy, Prince Liang was re-portrayed as a “Loyal Prince”. His image was incorporated into the lineage of loyal ministers, becoming a historical footnote to the new concept of Legitimacy.The changes in the historical writing of Prince Liang not only demonstrate the role of political power in shaping historical narratives but also reveal the mechanism of adaptation and reconstruction of the "Legitimacy" discourse under different political regimes.