Deng Xiaoping's Common Prosperity Theory is extensive and profound with rich content.Common prosperity is the essence,target and principle of socialism.People will finally reach common prosperity by allowing some of them become richer earlier in some places,which lies in the development of productivity.Its system guarantee is public ownership and distribution according to work.For realizing common prosperity,it is necessary to construct a well-off society in an all-round way,while common prosperity is the inevitable result of constructing a well-off society in an all-round way.Common prosperity has important instructive significance for constructing a well-off society in an all-round way.