Dacryocystitis is an ophthalmic disease, the symptoms are mainly tear overflow, tearing, extrusion of the lacrimal sac is the inner canthus below the extrusion of mucus or mucopurulent secretion. The formation of chronic dacryocystitis, the tear duct consists of the tear duct, tear duct, tear duct, tear sac, nasolacrimal duct, most of the dacryocystitis is due to the bottom of the pipeline nasolacrimal duct failure, nasolacrimal duct openings in the nasal cavity, in the front of the lower nasal passageway, due to the nasal diseases such as nasal septum deviation, hypertrophy of the nasal turbinate, nasal polyps, etc., resulting in the blockage of nasolacrimal duct openings caused by chronic dacryocystitis. Surgical intervention is required when chronic dacryocystitis does not respond well to medication. Lacrimal imaging, dacryocystography, and CT examination are routinely performed before surgery to find out the size of the dacryocyst and the obstruction site of the nasolacrimal duct, which provides the basis for surgery. Surgery is divided into internal nasal lacrimal sac anastomosis and external nasal lacrimal sac anastomosis. Nowadays, the external approach is less used, and there will be incisions and scarring in the inner canthus area. Nowadays, the external route is less used, and there are incisions and scars in the inner canthus. The internal nasal lacrimal sac anastomosis has a clearer vision and no scar on the outside, and it can deal with the obstructive lesions in the nasal cavity or sinuses at the same time, which is more popular among the patients.