Chronic dacryocystitis (chronic dacryocystitis) is caused by narrowing and obstruction of the nasolacrimal duct, resulting in retention of tears in the lacrimal sac and associated bacterial infection. It is common in women and is associated with trachoma, lacrimal trauma, nasal septal deviation, nasal polyps, nasal tumors, inferior turbinate hypertrophy, nasal surgery, etc. Clinical manifestations: 1, tear overflow; 2, pressure on the tear sac (corner area), with mucopurulent discharge from the tear dots; 3, tear duct flushing is not available or purulent discharge is flushed out; 4, lacrimal sac imaging shows nasolacrimal duct obstruction. Treatment: 1, non-surgical treatment: symptomatic treatment, antimicrobial eye solution spotting, lacrimal duct flushing. 2, surgical treatment: reconstruction of the lacrimal duct and the nasal passage. Common methods: 1, lacrimal duct exploration; 2, lacrimal duct hanging; 3, lacrimal duct placement; 4, lacrimal duct laser; 5, external nasal approach lacrimal sac nasal anastomosis. Some of the above methods are simple and easy to perform, some require repeated tear duct irrigation, but the effect is not ideal and easy to recur; some are traumatic, bleeding, and leave scars on the face after surgery. The new method (currently the preferred method): laser lacrimal ductplasty + tube placement for chronic dacryocystitis The surgery is less invasive, highly effective, less likely to recur, and maintains facial appearance. The success rate of the procedure is up to 90%. Advantages: 1. no facial incision, does not affect normal work; 2. easy surgery method; 3. accurate and fine surgery, little tissue damage; 4. light postoperative reaction, fast recovery; 5. no need to repeatedly flush the lacrimal duct after surgery; 6. 90% success rate of surgery.