<p>This thesis is about Han Chinese engagement with the ethnically diverse highlands west and south-west of the Sichuan basin in the first half of the twentieth century. This territory, which includes much of the Tibetan Kham region as well as the mostly Yi- and Han-settled Liangshan, constituted Xikang province between 1939 and 1955. The thesis begins with an analysis of the settlement policy of the late Qing governor Zhao Erfeng, as well as the key sources of influence on it. Han authority suffered setbacks in the late 1910s, but recovered from the mid-1920s under the leadership of General Liu Wenhui, and the thesis highlights areas of similarity and difference between the Zhao and Liu periods. Although contemporaries and later historians have often dismissed the attempts to build Han Chinese dominated local governments in the highlands as failures, this endeavour was relatively successful in a limited number of places. Such success, however, did not entail the incorporation of territory into an undifferentiated Chinese whole. Throughout the highlands, pre-twentieth century local institutions, such as the wula corvée labour tax in Kham, continued to exercise a powerful influence on the development and nature of local and regional government. The thesis also considers the long-term life (and death) of ideas regarding social transformation as developed by leaders and historians of the highlands.</p>