Measuring national power and designing a model with which we can compare countries in a certain time and or the situation of one country in two different times has always been one of the challenges facing scientists in Social Science. In this respect, to measure the power of countries many efforts have been made especially in the 60''s and 70''s. All of them have compared the countries from limited perspective. In this research a new model is presented to measure national power; it is much better than previous models. Paying attention to all the aspects of national power (Economical, Social, Cultural, Political, Military, Astro-space, Territorial, Scientific and Transnational),paying attention to the usage of 87 variables, are some of the benefits of this model. This book is not only explaining the designing of the national power evaluation model in 13 stages but also evaluating the power of 140 countries by using the above model. It is aimed at upper-level undergraduates, research students and academic researchers in Fields: Political Geography, Social Science, International relations ,Political science, Economic and Management.