Statistical index is a common tool in economic analysis. It is mainly used in economic evaluation and price changes. After years of development, it has expanded from simple field to economic and natural science research. At present, a large number of scholars at home and abroad have carried out in-depth research on the problem of statistical index, and have achieved certain results. As for the tool of statistical index, it has been promoted in various industries and plays an important role. This paper mainly analyzes the application of statistical index tool.