Objective To explore the effect of single port laparoscopic traceless technology for child contralateral latent hernia.Methods Three hundred and twelve children cases of unilateral indirect inguinal hernia in Mianyang 404 Hospital from June 2013 to June 2016 were retrospectively analyzed.Among them,170 cases receivedsingle port laparoscopic traceless technology and 142 cases underwent common open surgery.The gender,age,recurrent rate,onset site of unilateral side,cases number of postoperative contralateral asynchrony hernia occurrence,cases number of contralateral vaginal process deformity found by laparoscopy and onset time of postoperative asynchrony hernia were compared between the two kinds of surgery.Results Among the 142 cases of common open surgery,male accounted for 97.8％ and female accounted for 2.2％,and the average age was (2.45±2.18) years old;the postoperative contralateral asynchrony hernia occurred in 5 cases (3.5％),in which 1 case (0.7％) was in the right side and 4 cases in the left side,the difference between them was statistically significant (x2 =5.30,P=0.01),the asynchrony hernia occurred in postoperative 8,14,18,20,24 months.Three cases (2.1 ％) had hernia relapse.The laparoscopic surgery had 170 cases,including 145 male cases (85.3％) and 25 female cases (14.7％),the average age was (2.44±2.15) years old.The intraoperation found 86 cases (50.6 ％) of latent hernia of contralateral vaginal process deformity,while the asynchrony inguinal indirect hernia was not found,1 case had the relapse in postoperative 18 months,the difference was statistically significant compared with the patients with open surgery (x2=10.12,P=0.01).Conclusion Single port laparoscopic surgery for treating child unilateral inguinal indirect hernia can accurately judge whether having contralateral latent hernia and simultaneously conducts the operation compared with the common open operation,its postoperative relapse rate and asynchrony hernia occurrence rate are significantly decreased.