Abstract:in the early days of liberation, the party carried out the national work of preaching the party's national policy, establishing the grass-roots national power, training minority cadres in Liangshan area, as well as the specific practice of the United Front Work for the upper class of the Yi people, respecting the customs and beliefs of the Yi people, and opposing the narrow Han chauvinism, and achieved fruitful results. The development of economy and trade, the improvement of cultural and educational level, the expansion of the party's prestige among the masses, and the improvement of the relationship between Yi and Han people have been achieved. Practice has proved that the party's ethnic policy in Liangshan Yi area in the early days of liberation is a great practice of combining Marxism with China's national conditions and a concrete attempt to sinicize Marxism. These achievements have laid the foundation for the later democratic reform.