Skin soft tissue expanders are now widely used in clinical practice and are an important method of repairing large scars and skin tissue defects. However, due to the long period of dilator water injection, and most patients’ water injection is completed after discharge from the hospital, coupled with the lack of understanding of patient care of the dilator, a variety of complications related to improper patient protection and handling sometimes occur during the water injection period, which can seriously affect the whole process of expansion. In order to reduce the occurrence of similar situations, patients should pay attention to the following points during the skin soft tissue expander water injection: Precautions I. Pay attention to the protection of the operative area, including the soft tissue expander and the area where the water injection pot is located 1, should be absolutely avoided, such as violence, sharp objects, etc., direct action on the surface of the dilated skin flap. 2, close to the surface of the expansion of the flap clothing should be loose, soft, cotton fabric is appropriate. 3, try not to use cosmetics, winter is dry when the expansion of the flap surface can be coated with petroleum jelly, glycerin or baby skin care products. 4, pay attention not to burn, sunburn flap, prevent mosquito bites. Precautions two, pay attention to cleanliness and hygiene 1, the living environment should be as neat as possible, clothing often change. 2, conditional patients try to take a bath, but should not apply force to scrub the surface of the expanded flap. Patients with subcutaneous scalp expander placement should avoid scratching hard when washing their hair, and should not use sharp combs. Do not use irritating shampoo and body wash. Precautions 3, should not be strenuous exercise Any strenuous exercise may lead to the expansion of the flap injury, should be strictly limited. Precautions four, strengthen the nutrition 1, the postoperative recovery needs a sufficient amount of protein and calories. Some patients have poor appetite in the short term after surgery, so they should overcome the difficulties, ensure sufficient protein intake and pay attention to the balance of meals. 2. Pay attention to dietary hygiene and prevent food poisoning. 3.Don’t eat chili. Precautions V. Contact the doctor in charge of the bed in time if you find local redness, swelling, heat and pain, changes in the color and thickness of the skin flap, fluid leakage or leakage of the water bottle or dilator, etc., you should contact the doctor as soon as possible. Precautions VI. Special cases 1. Patients with external injection pots should change the medication regularly, keep the area around the injection pots dry and clean, and inform the doctor in time when redness, swelling and oozing are found. 2.Children patients need parents’ careful care. 3.Infection and dilator leakage and other cases should be handled in strict accordance with the doctor’s instructions.