1.Treatment method 1.Rective laparoscopic kidney cancer surgery: general anesthesia. The patient was placed in the healthy-side position, and three 10mm trocar operating channels were established in the lumbar region. Firstly, the lumbar fascia and the posterior fascia were separated in the midline, and then freed medially. The vena cava was found first on the right side, and the gonadal vein or ureter was found first on the left side, which was used as an anatomical landmark to separate upward to find the renal hilum. The connective tissue and vascular sheath around the renal hilum are separated, and the renal artery is freed by 2 to 3 cm, two on the proximal end of the renal artery and one on the distal end of the Hem-O-lok. after cutting the renal artery, the renal vein and its branches are freed on its deep surface, and the renal vein is clamped and cut with the Hem-O-lok. The perirenal fascia was separated and the anterior wall of the kidney was freed. The perirenal fascia was separated and cut medially at the upper pole of the perirenal fascia to the tip of the kidney using an ultrasonic knife. The perinephric fascia was separated outside the perinephric fascia to the level of the iliac vessels, the perinephric fascia was dissected, the ureter was separated, and the kidney was dissected after double titanium clamping treatment. The kidney specimen was put into the homemade specimen bag and removed from the first operation hole. 2.Open radical nephrectomy for renal cancer: general anesthesia. The patient was placed in the healthy side position. Take the 11-rib incision approach, free upward to reveal and push away the pleura, push away the peritoneum medially to reveal the perirenal fascia. The perirenal fascia was separated along the psoas major muscle, and the upper pole (including the adrenal gland), middle and lower pole of the kidney were released outside the perirenal fat capsule. The ureter was located and freed in front of the psoas major muscle at the lower pole of the kidney to the bifurcation of the abdominal aorta, and was cut and ligated. The kidney was retracted ventrally to reveal the renal hilum, the renal artery and vein were separated and severed by double ligation with a No. 7 silk suture plus a No. 4 silk suture. The kidney specimen was removed. II. Statistical methods The data were processed using sas8.0 statistical software, and the t-test for independent samples was used for comparison between groups of continuous variables, and the χ2 test was used for comparison between groups of categorical variables.