For patients with congenital tear duct deficiency, post-traumatic tear duct injury, functional tear overflow after facial palsy, patients who are still tearing after multiple lacrimal laser procedures, failed lacrimal sac nasal surgery, and tear duct injury after radiation therapy, the tear duct can be reconstructed through lacrimal bypass surgery to alleviate the patient’s tear overflow symptoms. IV Surgical method The lower part of the lacrimal caruncle in the inner canthus is created with a Koch needle for a conjunctival-nasal channel, and then a Medpore lacrimal bypass tube is implanted, which is fixed at the lacrimal caruncle with a thread at the surrounding tissues, and the tube of the nasal cavity is 2 mm away from the nasal septum, and the tube is flushed daily for 5 days after surgery, and then once a week for 3 weeks, after 1 month the lacrimal bypass tube has been fixed firmly, and the sutures at the lacrimal caruncle can be removed. The procedure is convenient, quick, less bleeding, short operation time, and can be completed under local anesthesia, with great clinical promotion value and a cure rate of 90%.