The first thing to do is to clarify the location and extent of the injury, and treat the wound according to the condition of the wound. If the wound is only superficial, disinfect the cut area and cover it with sterile gauze, and then change the medication on a daily basis; if the cut is deeper or larger, first cover the wound with sterile gauze, apply pressure to stop the bleeding, and then go to the hospital as soon as possible, and with the help of a professional doctor, clean the wound and suture it, and change the medication and remove the stitches in the hospital on a regular basis. One thing you need to pay attention to when you are cut by a knife is to see if there is any possibility of tetanus bacillus infection in the wound, and if there is a risk of infection, timely injection of tetanus vaccine. It is important to seek medical attention promptly after a cut occurs.