The onset of chronic otitis media is characterized by pus flow from the ear and hearing loss. Most of them can be cured with microscopic surgery. However, there are still some sites of otitis media that are very difficult to remove microscopically. In recent years, with the advancement of endoscopic technology, endoscopic otitis media surgery has been able to remove lesions that are difficult to find under the microscope, making the success rate of the surgery significantly higher. Endoscopy-assisted complete tympanoplasty is mainly used to examine and remove the lesions in the hidden parts of the middle ear that are difficult to be found under the microscope, and to repair the eardrum and reconstruct the auditory chain in order to improve hearing. Surgical advantages: high efficacy and few complications; Precautions: 1. Poor disinfection and improper use of postoperative antibiotics are among the causes of infection, but the vast majority of the causes are incomplete cleaning of lesions in the mastoid cavity during surgery, or due to improper selection of indications, patients who should undergo tympanoplasty only undergo tympanoplasty. 2, secondary cholesteatoma is often due to incomplete treatment of the cholesteatoma hidden in the tiny air chamber during surgery, or it may be due to insufficient treatment of the superior tympanic chamber and the eustachian tube, and the recurrence of cholesteatoma after surgery due to the reshaping of the “invagination pouch”. 3. Hearing is not improved or declined because of poor reconstruction of the auditory chain, adhesions in the tympanic cavity, poor opening of the eustachian tube and damage to the vagus. 4.Facial palsy, mostly due to tight compression of facial nerve exposure or infection. 5. Postoperative treatment (1) The ear sutures are removed in 1 week. (2) Remove the ear dressing and external ear canal opening gauze after 2 weeks. (3) Fill the ear canal opening with drier ethanol cotton balls daily and gradually clean the residual sponge after 3-4 weeks, and the new tympanic membrane will basically form after 3-4 weeks. (4) Antibiotics should be used appropriately for 1-2 weeks after surgery.