Varicocele (VC) is a common genitourinary disorder in men and a major cause of male infertility. It is mostly seen in young adults, with an incidence of 10% to 15% of the normal male population and 19% to 41% of male infertility. Varicocele is a vascular spermatogenic disorder caused by the expansion of the spermatic veins and trabecular plexus that surround the spermatic cord. It is more common on the left side, but can also occur bilaterally or solely on the right side. Traditionally, an inguinal incision is made to ligate the internal spermatic veins at a high level and to remove some of the dilated veins in the scrotum. The cause of varicocele is currently considered to be related to the following factors: 1. The human body usually takes an upright posture, so that the blood in the spermatic veins must overcome gravity to flow back upwards from below. 2, the spermatic vein valve is abnormal or lacking because the renal vein pressure is higher than the spermatic vein pressure, the spermatic vein valve plays the role of stopping the blood reflux. If the venous valve is lacking or incomplete, it will lead to blood reflux. 3.Weak connective tissue around the internal spermatic vein or underdeveloped levator muscle weaken the dependence around the internal spermatic vein. 4.The left internal spermatic vein is injected into the left renal vein at right angle The left internal spermatic vein is injected into the left renal vein at right angle unlike the right side. Due to the high pressure of the left renal vein, the upright position of the body makes this reflux more difficult. 5.The left internal spermatic vein is longer than the right internal spermatic vein, which is about 8-10 cm longer than the right, and the resistance to reflux increases hemodynamically compared to the right. 6.The sigmoid colon compresses the left internal spermatic vein, so that the blood reflux is blocked. 7.Proximal clamping phenomenon of superior mesenteric artery and abdominal aorta form an angle or congenital malformation of left renal vein after abdominal aorta, which compresses the left renal vein, thus causing obstruction of normal blood return to the left internal spermatic vein to form proximal clamping phenomenon. 8, distal clamping phenomenon left common iliac vein by the right common iliac artery compression, so that the left vas deferens vein blood return is blocked to form the so-called distal clamping phenomenon.