If there is yellowish oily fluid, we should pay attention to the redness, swelling, pressure pain, and hard nodules, combine with body temperature and blood picture, and routinely make bacterial culture of the exudate, The incision was then covered with povidone-iodine (PVP-I) gauze, and the incision was irradiated with a spectrometer for 30 minutes twice a day. If there is more exudate or longer duration, oral or intravenous antibiotics should be administered as appropriate to prevent infection. Generally, the sutures of the incision without exudate are removed 8-9 days after surgery, and the sutures of the exudate are removed 2-3 days after the complete cessation of exudate. Prevention methods (1) When making the abdominal wall incision, try to cut the whole subcutaneous fat layer at one time, and avoid repeatedly cutting the fat layer. (2) Avoid excessive electrocoagulation during hemostasis of the fat layer. (3) Pay attention to the protection of the fat layer with saline gauze during surgery. (4) Suture the fat layer well to avoid misalignment. (5) Fat liquefaction of the abdominal wall incision occurs mostly in obese patients. The prevention of incisional liquefaction uses high-frequency electric current to produce thermal effects in the patient’s body tissue. The local temperature generated by high-frequency electric cutting and electrocoagulation can reach 200-1000℃, and the long contact time between high-frequency electric knife and subcutaneous fat, repeated and high-power burning can cause superficial burns of subcutaneous fat and degeneration of some fat cells due to thermal damage, while capillary embolism occurs in the fat tissue due to thermal coagulation, which further obstructs the blood supply to the fat tissue with poor blood flow. Due to the weakness of postoperative patients, further development of incisional liquefaction may lead to incisional infection and other infections. In addition to fine operation, careful hemostasis, and suturing without leaving dead space, the following treatment measures can be considered beneficial to reduce the occurrence of poor postoperative incision healing. (1) Strictly control the use of the electric knife. When the electric knife is needed, the intensity of the electric knife should be adjusted to just cut the tissue, and never cut the tissue with high-intensity current. At the same time, the contact time between the electric knife and the fat tissue should be shortened as much as possible and repeated cutting of the tissue should be avoided to avoid the destruction of a large amount of fat tissue, as in this paper, only ordinary scalpels and ligatures are used in the subcutaneous tissue layer to stop bleeding. (2) When closing the abdomen, saline rinses the incision and dry gauze wipes away the free inactivated adipose tissue. (3) Minimize the exposure time of the incision. (4) Use antibiotics 30 min before surgery. Chymotrypsin, a biochemical preparation extracted from bovine pancreas, is a proteolytic enzyme that can rapidly decompose necrotic tissues to make them thin, facilitate drainage and elimination, accelerate wound purification, and thus favor granulation tissue generation, so it is now used for wound healing, anti-inflammation and prevention of local edema and blood accumulation after trauma or surgery. If the epidermis is not cracked, the wound may not be opened but the exudate is squeezed out, then α chymotrypsin powder 2mg is evenly sprinkled on the wound, finally the wound is fixed with sterile butterfly tape to eliminate the dead cavity, and the medicine is changed after 3 or 5 days. This method for the treatment of fat liquefaction in abdominal incision is simple, with satisfactory efficacy, and is worth promoting. Application of hypertonic sugar in fat liquefaction Application of chymotrypsin to treat fat liquefaction is a good idea, but we also had good results in dozens of cases of fat liquefaction with hypertonic sugar, firstly, it was clear that the wound was fat liquefied without infection. The sutures at the liquefied area were removed, the wound was cleared and changed several times, the wound was rinsed with saline after the exudation was reduced, dry gauze was wiped dry, and an appropriate amount of 50% hypertonic sugar was poured into the wound disc-shaped adhesive tape and pulled together. The principle is to use high sugar to make the cells around the wound in a hyperosmotic state, reduce the exudation from the wound, and have an adhesive effect, with the disc-shaped tape pulling together to eliminate the residual cavity is more conducive to tissue healing.