【摘要】The paper conducts order relative analysis of GNP per capita calculated according to exchange rates and those according to PPPs of 26 countries published in World Development Report prepared by World Bank. It proves that there is a positive order relative relationship between the two indicators. In the meantime, the author also establishes the indicator ρ which can show comprehensively the economic power and welfare of each country and thereby indicates the characteristics of exchange rate and living level of each country.