This article is a case study on the Yunnanese scholar Li Yuanyang under the background of the Ming's incorporating and sinicizing Yunnan, exploring how he views the Ming's actions and writes Yunnan's becoming a part of China. First, it retells Li's life experiences and examines the Yunnan native things and Chinese traditions in his writings. Then, after noting his emphasis of Yunnan's belonging to China, it concentrates on his comments on the Ming's military campaigns. As it analyzes, on the one hand, he justifies these campaigns against indigenous rebellions, on the other hand, he also criticizes unnecessary wars and some imperial officials' selfish deeds. Besides, he considers the constructing and reconstructing projects as a symbol of the central state's righteous governance, which should also bring benefit and benevolence to the indigenes. In a word, Li's case reflects the deep impact of the Ming's invasion on the local elites, as well as how they react to this.