This paper applies the Grey correlation analysis method in the Grey system theory and takes the Grey correlation degree as the measurement index to analyze the relevant factors affecting the tourism income. It finds that the leading factors affecting the domestic tourism income of a certain region are the per capita consumption expenditure of rural residents and the number of domestic tourists. At the same time, it reveals the correlation degree between the tourism income and various influencing factors from an empirical point of view. To make recommendations for the increase of regional tourism revenue.