Based on the data of defense expenditure and GDP from 1997 to 2017, this paper discusses the relationship between China's defense expenditure and economic growth in the past 20 years, and further analyzes the relationship between economic construction and national defense construction in the process of military-civil integration. Develop relationships. Firstly, through descriptive statistics, correlation analysis, regression analysis and other methods, the relationship between defense expenditure and GDP is preliminarily discussed; then the relevant calculation and analysis are carried out based on VAR model; finally, these methods are combined and the results are A more systematic and comprehensive discussion. The results show that in the past 20 years, China's defense expenditure has been positively correlated with economic growth. Economic growth and defense spending can promote each other and present a benign relationship. In the long run, not only economic growth is conducive to the increase in military spending, but in turn, defense spending can also regulate the economic aggregate and promote the full use of existing resources to promote economic growth. This reflects from the side that in recent years China's national defense construction and economic construction, security and development can achieve overall consideration, and the overall development of military-civilian integration has achieved remarkable results. The national strategic coordination capability for building military-civilian integration is constantly improving.