ALB and malnutrition: After surgical trauma and nutrition digestion, the post-operative nutritional indices of the two groups on the first post-operative day were significantly reduced, but the post-operation nutrition and immune indices of the EN group were still higher than in the control group, as pre-operative strengthening nutrition support therapy was able to correct part of the pre-operative malnutrition and provide more peri-operative nutrition reserves, while using less albumin.