In order to achieve satisfactory results, all patients who decide to have the surgery should make some appropriate preparations: 1. The patient should clearly explain to the surgeon the purpose and requirements of the surgery, whether he/she is suitable for the surgery, the possible results after the surgery, and how long he/she can start his/her normal working life after the surgery. 2.Understand the general procedure of the surgery, the possible situation during and after the surgery. 3.After fully understanding the risks of the surgery and deciding to have the surgery, sign the consent form for the surgery. 4.Prior to surgery, you should stop wearing soft corneal contact lenses (contact lenses) for 1-2 weeks, hard corneal contact lenses for 2-3 weeks, and OK lenses for 3-6 months. 5, 3 days before surgery should generally be local antibiotic eye drops. 6.Pre-operative gaze training should be done so that you can cooperate well with the surgeon during the operation. 7.Adequate sleep should be given the night before surgery. 8, wash your face on the day of surgery, do not put makeup on your eyes to avoid difficulties in cleaning and disinfection of the eyes before surgery, such as incomplete cleaning can make some fine particles enter the surgical area; do not use perfume and any cosmetics with irritating odor, so as not to interfere with the working state of the laser machine and affect the effect of surgery. 9.After local disinfection of the eye before surgery, do not wipe or touch the eye with your hand again. 10.When waiting before surgery, relax, do not be nervous, do not talk or make loud noises between preparations so as not to be overexcited during surgery and unable to control your emotions and affect the surgical results.