In light of the logical clue of " what-why-how",Xi Jinping’s major expositions on the building of a moderately prosperous society together with minority nationalities and ethnic regions of China clarified its top priority,important significance,key task and solution.It means,from a realistic point of view,that we should follow a practical path of making concrete,meticulous,and effective efforts in eight principal work in four respects.These major expositions unify the scientificity and practicality,integrates the systematicness and accuracy,connect the strength of the system and individual initiative,and combine the inheritance and creativity.They are the new development of the integration of Marxism with the reality of ethnic regions and will be the fundamental principle to guide the minority nationalities and ethnic regions to build a moderately prosperous society.