Congenital lacrimal duct obstruction and its associated neonatal dacryocystitis are congenital eye diseases of children with a high prevalence. The prevalence of congenital lacrimal duct obstruction in healthy newborns is 5-6%. The common cause is a membranous obstruction of the Hasner valve covering the end of the nasolacrimal duct, resulting in persistent lacrimation and infection. The timing of surgical intervention and treatment of lacrimal obstruction in infants and children has been a controversial issue. At present, the timing of treatment tends to be younger, with the highest success rate of primary exploration at 2-4 months of age and decreasing significantly with age; the success rate of re-exploration and multiple exploration decreases significantly compared to the initial exploration. Tips: 1, congenital lacrimal duct obstruction and dacryocystitis advocate early lacrimal duct exploration, but repeated multiple explorations cause a lot of damage. 2 times or more ineffective recommended intubation to reduce the medical source of injury. 2.Children with congenital lacrimal duct malformation or bony stenosis cannot be forcibly lacrimal tract exploration. In children with lacrimal duct obstruction, lacrimal intubation is the procedure of choice for those with repeated unsuccessful lacrimal tract exploration. Tear canal intubation Tear canal intubation is indicated for: 1, tear duct obstruction 2, common tear duct obstruction 3, nasolacrimal duct obstruction 4, tear point stenosis The drainage tube in the tear duct after tear canal intubation acts as a continuous support to dilate the tear duct, drain the tear fluid, repair the obstructed and adherent tear duct, and restore the chronic inflammatory reaction of the tear sac to a physiological tear duct. Commonly used lacrimal intubation procedures: Crawford lacrimal intubation; Ritleng lacrimal intubation; memory wire lacrimal intubation; new lacrimal recanalization tube (RS type) intubation, etc. Memory wire lacrimal intubation is suitable for children with lacrimal duct obstruction at a younger age. Advantages: (1) No damage to the infant’s lacrimal tract during the operation; (2) Minor damage to the inferior nasal tract during the operation, which can reduce the occurrence of nasal bleeding caused by blind hooking. (3) Easy to operate. (4)Easy to master.