The cleft lip flap surgery for three-year-old babies is divided into unilateral cleft lip revision surgery and bilateral cleft lip revision surgery according to the severity. 1. Unilateral cleft lip revision surgery: Generally, the lip area is firstly designed for incision at a fixed point, and then cut, rotate, and carry out the alignment of the tissues, for the lip flap to advance the tension is large when the need to do the vestibular groove relaxation incision and stripping. Trim and suture the aligned tissue flap. 2. Bilateral cleft lip revision surgery: bilateral cleft lip revision surgery also needs to be fixed point, both sides of the cleft lip fixed point is basically the same, and then along the fixed part of the incision to the subcutaneous, peeling up the skin and mucous membrane flap to the oral side, and then use the layered retrograde suture method from the bottom to the top to ensure that the height of the upper lip symmetry. A comprehensive sequential treatment program is also required after cleft lip flap surgery, and after the initial revision, a second phase of revision should be considered based on the remaining nasolabial secondary deformities.