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Background: Recently, the use of posterior mucus flap has been introduced as a new technique for DCR, which has had a great success, as well as bone overlapping and minimal postoperative obstruction. Considering the need for these flaps to have a very good success, the purpose of this study was to examine the DCR endoscopic method using mucosal flaps for double-sided overlapping (as a new flap). Methods: In this clinical trial study, 60 patients undergoing DCR endoscopy referring to Amin and Al-Zahra hospitals during 1396 to 1398 entered the study. Patients were divided into two groups, which included endoscopic DCR by using mucosal flaps for double-sided and non-flip overlapping. The success rate of surgery, postoperative pain and its complications were studied in two groups. Results: Among the complications observed after surgery, hematoma (6.7 in each group), bleeding (3.3% in each group) and nasal secretion (10% in the intervention group and 6.7% in the control group) were observed. No tear and obstruction of tear ducts were seen in the two groups. There was no significant difference between the two groups based on the complications of postoperative pain and the success rate of surgery (P>0.05). Conclusion: Using the double-sided overlapping flap method, the results of the same operation were similar to using the non-flap method. Therefore, the use of both endoscopic DCR techniques with two-way overlapping flap and without using it were two effective methods with limited complications.