Abstract: Objective To study the clinical study of single hole laparoscopic percutaneous extraperitoneal ligation（LPEC）in the treatment of children with traffic hydrocele.Methods The clinical data of 76 children with traffic hydrocele were retrospectively analyzed.The postoperative condition of end-diastolic phase of single-hole LPEC，peak systolic blood flow velocity（PSV），enddiastolic flow velocity（EDV），testicular artery resistance index（RI）were analyzed.Results All the 76 children successfully completed single-hole LPEC surgery，and no patients were transferred to open surgery during the operation.No spermatic cord，vas deferens，testicle，testicular artery and other gonadal vessels were damaged after operation.Local infection was found in 1 case（1.32%）and mild scrotal edema in 2 cases（2.63%）.After 6 months of follow-up，the scar was basically dissipated in 76 children，and there was no incisional hernia formation or recurrence of hydrocele，no vasectomy torsion or testicular atrophy.The preoperative PSV，EDV and RI of 64 children with unilateral communicating hydrophilia were（65.26±6.23）min/ml，（48.06±4.68）min/ml，（0.55±0.09）ml·min·m2，respectively;the data of 1 month after surgery was（79.21±7.10）min/ml，（55.29±5.61）min/ml，（0.59±0.12）ml/min·m2，respectively;the dataof 3 month after surgery was（104.59±8.72）min/ml，（72.59±6.45）min/ml，（0.83±0.14）ml/min·m2，respectively;the data of 6 month after surgery was（135.92±10.46）min/ml，（87.39±7.32） min/ml，（1.02±0.16）ml/min·m2，respectively.There was significantly difference in children with unilateral traffic hydrocele at 6 months after operation than preoperative，postoperative，1 month，3 months（P<0.05）; the RI of 1 month after operation had not significantly different than that before surgery（P>0.05）.The preoperative PSV，EDV and RI of 12 children with bilateral communicating hydrocele were（60.14±6.05）min/ml，（44.52±4.50）min/ml，RI（0.54±0.08）ml/min·m2，respectively;the data of 1 month after surgery was（75.13±6.92）min/ml，（49.78±5.11）min/ml，（0.57±0.10）ml/min·m2，respectively;the data of 3 month after surgery was（98.76±8.15）min/ml，（62.19±6.33）min/ml，（0.81±0.12）ml/min·m2，respectively;the data of 6 month after surgery was（129.48±9.82）min/ml，（80.16±7.05）min/ml，（0.96±0.13）ml/min·m2，respectively.There was significantly difference in children with unilateral traffic hydrocele at 6 months after operation than preoperative，postoperative，1 month，3 months（P<0.05）; the RI of 1 month after operation had not significantly different than that before surgery（P>0.05）.Conclusion Pediatric traffic hydrocele is treated with single-hole LPEC，which can significantly improve the blood supply of the testis，and the incidence of complications is low，the surgical incision is small，and it has high clinical efficacy and safety.

Key words: laparoscopic percutaneous extraperitoneal ligation, infantile communicating hydrocele, testis, curative effect