On the inner surface of the orbital bone above the outer part of the eye is a lacrimal gland which, like a spring, constantly produces teardrops that constantly cleanse the eye to keep it shiny and clean. After wetting the eye from the top down, they collect at the inner corner of the eye and flow through the tear duct, the lacrimal duct, the common tear duct, the tear sac and the nasolacrimal duct to the nasal cavity. Currently, for tear duct obstruction, tear laser technology is one of the most advanced treatment methods, with the advantages of less thermal damage to surrounding tissues, short time, no bleeding, no hospitalization, no incision, and is the ideal outpatient procedure for tear duct remodeling. The principle of lacrimal laser treatment for lacrimal duct obstruction: the tissue is vaporized and the luminal obstruction is punctured, which requires less energy and has a high vaporization rate and does not lead to substantial tissue heating, and very little damage to the surrounding tissues and easy to restore the lacrimal duct itself tubular structure. The lacrimal laser not only has good effect on the treatment of simple lacrimal obstruction, but also can achieve good clinical effect on the lacrimal duct trauma scar obstruction and lacrimal sac nasal anastomosis failure. In addition, the lacrimal laser is a minimally invasive procedure, which can be repeated several times to achieve satisfactory results. Coupled with the low cost of the procedure, it has gained wide popularity and praise from patients with lacrimal overflow. Indications for lacrimal laser surgery: 1, lacrimal duct and common lacrimal duct obstruction; 2, lacrimal duct obstruction and chronic dacryocystitis; 3, cases of failed lacrimal sac nasal anastomosis; 4, physiological bone nasolacrimal duct obstruction; Relative indications for lacrimal laser surgery: 1, occlusion of the lacrimal dots; 2, chemical lacrimal burns; 3, severe trachoma secondary to lacrimal duct obstruction; 4, nasolacrimal duct obstruction with basically normal orbital trauma bone structure; 5. Nasolacrimal duct obstruction with a small lacrimal sac; 6. Nasolacrimal duct membrane in newborns.