Knife cuts are sharp instrument injuries, superficial injuries only need simple debridement and bandaging, while deeper injuries require thorough debridement and surgery. If it is only a superficial knife cut, the wound is usually superficial and bleeding less, only need simple debridement, bleeding, bandage, in addition can be injected with tetanus vaccine or immunoglobulin to prevent tetanus; if the knife wound penetrates deeper, may hurt the internal deep blood vessels and nerves, or internal organs, etc., it should be thoroughly debrided, and then repaired by surgery. After the above treatment, the patient should pay attention to avoid the wound being exposed to water, and go to the hospital regularly to change the medicine, and avoid heavy labor during the recovery period, so as not to affect the healing of the wound.