The incidence of varicocele is about 12%, and infertility caused by varicocele accounts for 9% to 41% of male infertility. The main reasons for male infertility caused by varicocele are: 1) the average testicular temperature is higher than normal; 2) the pressure in the spermatic vein increases and blood stagnation interferes with the metabolism of the testes; 3) the testes are locally deprived of oxygen due to impaired venous blood return and the environment for sperm growth changes; 4) the influence of toxic substances in the refluxed blood in the spermatic vein can lead to testicular spermatogenic dysfunction; 5) the testicular secretion cells are inhibited and the secretion of testosterone decreases; 6) the left and right testicular plexuses are inhibited and the secretion of testosterone decreases; 6) the testicular plexus is inhibited. Inhibited and the secretion of testosterone decreases; 6, the left and right testicular venous plexus traffic each other, so varicocele on one side often causes damage to both testes. As a result of these reasons, testicular damage is eventually caused. Performance of spermatogenic function is inhibited and semen quality is changed (decrease in sperm count, increase in the proportion of deformed sperm as well as immature sperm, and decrease in sperm motility). Treatment includes symptomatic treatment, pharmacological treatment and surgical treatment.