During construction of socialist modernization,building a well-off society in an all round way is a target which will be achieved in 2020.The scientific outlook of development is a creative theory which dominates the development of the economic society.A harmonious society is an ideal and a goal in the process of developing human society.There is an internal consistency among three of them.The relationship between building a well-off society in an all round way and creating a harmonious socialist society is as same as that of goal and ideal.The relationship between the scientific outlook of development and a harmonious socialist society is like putting theory into practice.In terms of achieving the target of national economy and social development,both fulfilling the scientific outlook of development and creating a harmonious socialist society is intent to speed up the achievement of the strategic objective of building a well-off society in an all round way.In regard to the guiding ideology and the program of action,both building a well-off society in an all round way and creating a harmonious socialist society should be under the guideline of the scientific outlook of development.