1, da Vinci femtosecond has the international leading small spot scanning technology, safe and stable low energy control, which has the least impact on the surrounding tissues, the cutting surface is very smooth, and is known by ophthalmologists as the most friendly laser for the eyes. Other femtosecond has a large spot and produces a corneal flap that is not smooth enough and has a greater impact on the eye. 2.The thickness of the corneal flap made by the da Vinci femtosecond laser is uniform, which is conducive to improving the speed of postoperative repair and the quality of postoperative vision. 3. The unique patented design of the da Vinci femtosecond laser shortens the intraoperative waiting time. Patients do not need to wait after the flap is created and do not need to change the surgical bed. Other femtosecond flap making bubbles do not disappear immediately and require a wait of about 20 minutes. Patients also need to change the surgical bed, which increases the chance of infection and instability. 4, da Vinci femtosecond laser through the U.S. FDA, the European Union CE, China SDA triple certification, and from 2009 to become the world’s ophthalmology industry’s optimal femtosecond laser equipment, the internationally renowned Shinagawa Eye Center, the domestic ophthalmology leader Tong Ren ophthalmology will update the femtosecond equipment for da Vinci femtosecond laser. And other femtosecond although the market early, but because of various shortcomings can not be improved and gradually eliminated. 5, da Vinci femtosecond laser frequency is 1000KHZ, while other femtosecond only 15 to 60KHZ or 150KHZ. the higher the emission frequency, the higher the cutting accuracy. Da Vinci is much better compared with other femtosecond.