Objective:To evaluate the safety and efficacy of preoperative D-J stent placement in ureteroscopic lithotripsy(URL) by Meta-analysis. Methods:PubMed,Embase,Cochrane Library,VIP,Wanfang and CNKI database were used to collect the randomized controlled trial(RCT) or controlled trials of the effect of preoperative placement and not placement of D-J stent. The data were up-dated to June 2017. Quality of the literature was evaluated. Meta-analysis was performed using Revman 5.2. Sensitivity analysis and publication bias test of inclusion literature were assessed by the Stata 12.0. Results:A total of 12 440 patients were enrolled in 14 clinical studies. Meta-analysis showed that the stone-free rate(SFR) was higher in the intentional preoperative D-J stent(IPS) group than in the not preoperative D-J stent(NPS) group(RR=1.08,95%CI=1.02 to 1.14,P=0.007). SFR of the renal and proximal ureteral calculi was higher in the IPS group than in the NPS group(RR=1.46,95%CI=1.05 to 2.03,P=0.02),and there was no signifi-cant difference in SFR of distal ureteral calculi between IPS group and NPS group(RR=1.14,95%CI=0.92 to 1.42,P=0.24),and it was the same result in terms of operative time(SMD=-0.21,95%CI=-0.73 to 0.32,P=0.44) and complications(RR=0.78,95%CI=0.52 to 1.18,P=0.25). Conclusion:Preoperative D-J stent for URL can increase SFR,especially for kidney and proximal ureteral stones patients.