Laser treatment of cataracts is now being progressively carried out in clinical practice. Compared with traditional cataract surgery, the incision design of the surgery is more precise and less invasive, and therefore the quality of vision after the surgery will be better. The principle of the surgery is to perform cataract ultrasonic emulsification under the guidance of femtosecond laser. Part of the operation is performed under the guidance of laser, including the making of surgical incision, the setting of the diameter of the tearing capsule, the process of tearing the capsule, and the process of splitting the nucleus, so the surgery becomes less traumatic. Therefore, young cataract patients or those with good eye conditions and no problems other than cataracts may consider treating their cataracts in this way.