Aim to study the relation between green manure varieties and the activity of soil enzymes and soil fertility, correlation analysis, canonical correlation analysis and principal component analysis were used in this paper to study the effects of returning different green manures on soil enzyme activities and fertility on the basis of a field experiment. The results showed that the returning green manures obviously increased soil enzyme activities, soil nutrients and physical properties, with similar characteristics in effects, mainly influenced the activities of soil urease, catalase and acid phosphatase, and influenced the contents of alkaline hydrolysis nitrogen and phosphorus, while mainly differed in the changes of soil bulk density, porosity, pH, organic matter, total nitrogen, available potassium and hydrogen peroxide enzyme activity. There are significant positive correlations between soil edaphic physicochemical factors and activities of soil urease, acid phosphatase, invertase and catalase, while there are also high significant positive canonical correlations between soil fertility and soil enzyme activity. The results are of great importance to the tobacco production and soil improvement nowadays.