Surface anesthesia is a strong penetration of local anesthetic and local mucosal contact, the anesthetic will penetrate the mucous membrane to act on the nerve endings and produce local anesthesia, known as surface anesthesia, commonly used surface anesthesia methods are as follows: 1, ocular surgery, eye drops surface anesthesia method in ophthalmology surgery is often used; 2, for the mucous membranes of the nasal cavity, you can use a piece of cotton dipped in medicine to fill the method of surface anesthesia, which is the use of a small piece of cotton to soak the local anesthetic. Soak the local anesthetic, remove the excess local anesthetic liquid extrusion, and then the tablet is applied to the nasal turbinate and nasal septum between the surface anesthesia can be produced in about 3 minutes; 3, for the pharyngeal trachea and bronchial tubes, surface anesthesia with a spray method, is the surface anesthesia often used in tracheoscopy and bronchoscopy, the same anesthesia in the surgical anesthesia process of the tracheal intubation of the awake will also be used frequently surface anesthesia method; 4, there are also cricoidal anesthesia methods. Surface anesthesia method; 4, there is also the surface anesthesia method of puncture and injection of cricothyroid membrane, the patient takes the lying position, the needle is inserted between the cricoid cartilage and the thyroid cartilage, the cricothyroid membrane is punctured, and local anesthetics is injected after the gas is pumped back. When puncture and injection, the patient is instructed to hold his breath, and after the injection is completed, the patient is encouraged to cough, so that the local anesthetic drug is fully distributed uniformly, and then after 2-5 minutes, the upper pharynx of the trachea and the lower part of the larynx will appear local anesthesia; 5, surface anesthesia of urethral insufflation method is often used in male surgery, the male patient can use the lavatory or syringe to instill the local anesthetic drug into the urethra, and then hold the head of the penis for 3-5 minutes, which will make the urethral mucosa produce surface anesthesia. mucosa to produce surface anesthesia.