In structure and clinic. The abdominal white line of animals is located on the median line of the anterior abdominal wall, between the left and right rectus sheath, and consists of three layers of flat aponeurosis fibers on both sides. White thread has an important application in surgery, especially in abdominal surgery. Because there are almost no blood vessels at the white line, cutting here can reduce bleeding. However, due to the large abdominal tension, the suture at the white line is easy to tear off, and sometimes even white line hernia appears, which has certain challenges for surgery. Therefore, the abdominal white line of animals has anatomical significance in structure and clinic.