With important significance in both theory and practice,'Declaration of Happiness in Prosperous Society'issued by the New Economics Foundation is one of the documents among numerous declarations.The historical background of the declaration and the evolution of human social life,taking place after the publication of the document,impel us to embrace a new revolution aiming at building a happiness society outlined in the declaration,which is what Adam Smith defined as the happiness revolution.The revolution is of great and lofty decrees and its goals is comprehensive,covering economics,politics and education.The stage for the revolution has already been set,and what it needs is a theoretical guidance.Therefore,it is necessary to carry out the happiness revolution in theory and create new social science systems based on the principle of taking eudemonics as a 'mother discipline'.Facing the new revolution,we should strive to build a harmonious society.It is not only the basis but also the essential requirement of a happiness society.