Establishment and Evaluation of National Power Index System: Evidence from Evidence‐Based Analysis

National power is the basis of the current competition and game between global sovereign states. It is the organic integration and concentrated expression of the multi‐dimensional and complex factors of politics, economy, society, culture, ecology, value system, and history of any country. Due to the complexity of national power and the non‐objectivity of the assessment, the concept of national power and assessment must be constructed using multiple levels of evidence. Therefore, this paper constructs a three‐level evidence chain national power index system based on the systematic literature review, public value theory, and expert scoring, and takes the G20 countries as an example to measure the change and motive force of national power of the major countries in the world from 1992 to 2017. Research shows that national power is fundamentally dependent on the creation of multiple public values, and the trend of “weak countries getting weaker and strong countries getting stronger” among countries has strengthened. The increase of national power in different types of value power is not synchronous, but there are key points and outstanding improvements.