Effect of Mitomycine C on DCR (Dacryosystorhinostomy) with endonasal endoscopic guidance examine in a double blind accidental survey. Patients with lacrimal duct stenosis referring to medical centers affiliated to Kashan university of medical sciences who aged 35-65 years old and tearing along with (Recurrent acute dacryocystitis, increase in lacrimal minisc, have a reflux when the pressure on the lacrimal sac, Confirmed the diagnosis of nasolacrimal lavage selected. Patient with history: tearing at birth, trauma to face and nose, Nasal and sinus surgery, Mucosal lacrimal sac, canalicole obstruction, Coagulation disorders, hemophilia, other external nasal disease, lacrimal sac neoplasm, Corneal ulcers or foreign body on cornea, abnormality in ponctum position are excluded from study. Sample size 92 patients calculate (46 for each group). During surgery sponge impregnated with 0.02 precent mitomycin C use in osteotomy site for five minutes and then Washed with 50 cc normal saline and clean with endonasal endoscopic guidance. For control group use placebo instead of Mitomycine C. epiphoria follow.