The Liangshan region, located in southwestern Sichuan, China, is historically a multi-ethnic area with complex inter-ethnic relations and governance challenges. After the founding of the People''s Republic of China, the Party pursued a three-dimensional policy approach—political empowerment and reconstruction of order, revolution in economic foundations with the realization of distributive justice, and restoration of cultural symbols along with the reproduction of identity—which promoted social reform within the Yi community of Liangshan. This approach achieved identity reconstruction in political integration, ethnic cooperation and mutual integration under economic sharing, and strengthened spiritual bonds through cultural coexistence. The practice demonstrates that the Party''s ethnic policies in the Yi regions of Liangshan during the early years of the PRC were a remarkable implementation of Marxist national theory adapted to Chinese circumstances—a concrete attempt to sinicize Marxist national theory. These achievements laid the foundation for later democratic reforms. In the new era, it is necessary to activate endogenous drivers of inter-ethnic integration through multi-dimensional collaboration, strengthen the foundation of ethnic equality governance through institutional adaptation, and consolidate the construction of a Chinese national community through identity cultivation, drawing wisdom from historical experience and gathering strength through innovative practice to inject lasting power of ethnic unity into the cause of national rejuvenation.