Lacrimal duct disease is one of the common diseases in ophthalmology, which can cause ocular tearing, overflow of pus, and in severe cases, cause ocular infections leading to blindness, therefore, early diagnosis and treatment is very important, but the traditional treatment methods have poor efficacy. In recent years, although laser and catheterization have improved the success rate, the operation is easy to form a false channel, postoperative scar proliferation, and some patients recur, which leads to surgical failure. The application of the lacrimal endoscopy system can carry out lacrimal examination and probing treatment under direct vision, minimally invasive, and it is currently the only one of the best inspection technology that can directly observe the condition of the lacrimal mucosa, it can also provide guiding opinions for nasal lacrimal anastomosis, and it can also be used in conjunction with laser to carry out lacrimal reconstruction with minimal damage, thus greatly improving the success rate of lacrimal surgery. This lacrimal endoscopic system is mainly used for a variety of lacrimal diseases such as lacrimal tubule obstruction, common lacrimal duct obstruction, nasolacrimal duct obstruction, chronic dacryocystitis and re-obstruction after nasal lacrimal sac anastomosis.