Objective:To systematically review the effectiveness and safety of ureteroscopic lithotripsy combined with ntrap for upper urethral calculi. Methods:All randomized clinical trials and case-controlled studies of ntrap during ureteroscopic lithotripsy(URL) for upper urethral calculi were identified with PubMed,Cochrane Librily,Embase,WangFang and CNKI. Quality assessments of litera-tures and data extraction were independently performed by two reviewers. Meta analysis was performed with Revman 5.0. Results:Two randomized trails and 2 case-controlled studies involving 682 patients were collected. Meta-analysis demonstrated that:ntrap group demonstrated a significant advantage over control group in terms of calculi clearance rate(OR=4.28,95%CI=2.51 to 7.28,P=0.000). Incidences of calculi migration and auxiliary lithotripsy were significantly lower in ntrap group than in control group(OR=0.09,95%CI=0.01 to 0.62,P=0.01;OR=0.18,95%CI=0.05 to 0.67,P=0.010). There was no statistical difference in mean operation time between the two groups(WMD=-0.09,95%CI=-10.25 to 10.06,P=0.990). Conclusions:URL combined with ntrap for upper urethral calculi had higher calculi clearance rate,lower incidence of calculi migration and auxiliary lithotripsy than URL without ntrap.