Refractive surgery technology has developed rapidly in recent years, and surgical procedures are changing rapidly, bringing benefits to patients. From deep cutting to superficial cutting, from extra-ocular to intra-ocular, from single excimer laser to femtosecond laser to full femtosecond laser, each technological innovation is based on higher patient safety and comfort. Even so, not all patients are suitable for this type of surgery. What are the indications for surgery? 1, age 18-50 years old 2, refractive error stability for more than 2 years, try to exclude progressive myopia 3, corrected visual acuity of 0.8 or more, no other eye diseases and eye surgery history 4, physical and mental health, no systemic diseases affecting wound healing 5, patients voluntarily accept the treatment and can cooperate 6, soft corneal contact lenses need to take off the lens 2 weeks, RGP need to take off the lens 3 weeks, keratomileusis need to take off the lens 3 months re-examination.