The national history the United States indicates that the formation of the American Dream has profound historical and cultural origins and a long course of the construction.The American Dream commits that everyone has an equal opportunity to succeed.As long as working hard,one can realise his personal dreams.the strong appeal of the American dream has actually based on individual freedom of its inherent,hard work,thrift and other traditional values.However,the development and changes of American history lead to some cultural and social problems,which indicates that traditional American values produce over chase wealth and excessively praise individualism.Now the traditional values inherent in the American dream have been gradually declined.The historical study shows in order to change this situation,American dream needs self-reflection and to absorb and learn values from other cultures.