Separation of the Toldt gap: This fascial gap is located between the colonic mesentery and the anterior renal fascia and the pre-aortic fascia and is a loose connective tissue gap. The microscope-holding physician should get a close view of the ureter, especially across the ureter, which is the critical area. Submesenteric artery: Shoot the lens in from the right side so that the surgeon feels that his or her line of sight is essentially perpendicular to the patient’s torso. The trunk of the abdominal aorta is parallel to the lower edge of the monitor, and the submesenteric vessels are at an angle of 30 degrees to 45 degrees from the abdominal aorta. Then, the angle of the 30-degree lens is continuously adjusted, and together with another assistant, the operator can clearly see the vascular path from above, laterally and below the submesenteric artery to facilitate dissection of the vessels.