The steps of nasal endoscopic nasal lacrimal sac anastomosis are as follows: 1. The surface of the tympanic membrane was separated and the mucosa was turned backward to expose the frontal process of the maxilla and all of the lacrimal bone, and the bone suture of both was visible; 4, the frontal process of the maxilla was removed with a bone chisel, and the anterior part of the lacrimal bone was separated and bitten off to form a 1 cm diameter bone window, exposing the slightly blue inner wall of the lacrimal sac; 5, the lacrimal sac was inserted from the tear dots with a probe, and the lacrimal sac was incised and the inner wall was removed under the guidance of the probe, and the area around the bone window was cleared Bone chips and mucosal tissue around the bone window are removed and the tear sac is flushed; 6. A silicone tube can be placed in the tear sac area to prevent scar formation and improve the surgical effect.