Dacryocystorhinostomy(DCR) has been regarded as the gold standard for the treatment of nasal lacrimal duct obstruction for over a hundred years.Currently,the treatment of nasolacrimal duct obstruction has grown along with the advances in endoscopic techniques developing and in-depth understanding of the mechanisms of lacrimal drainage.Endoscopic dacryocystorhinostomy,endolacrimal laser and intubation,lacrimal endoscopic recanalization and lacrimal bypass surgery have been employed to substitute for external DCR as treatment for nasolaerimal duct obstruction.The endoscope,laser and minimally invasive techniques provide higher successful rates with minimal wounds,lower rates of both recurrence and complications and allow quicker recovery after surgery.