Different from the mainstream economics， behavioral economics takes the hypothesis of “new economic man”. The significance of the methodology lies in that its coming makes “rational economic man”， the mainstream economics’ refuting reasons， difficult to stand， keeps its observation about the economy subject’s behavior within a proper distance， turns the economic theory mostly back to the real world and gets proud flexibility. Its practical value lies in providing the economics’ experimental methods a broad space， weakening the contrary between the economics and psychology， the ethics and sociology and so on， providing realistic logic basis for all kinds of behavioral economic theories.