Congenital hip dislocation is a common genetic disorder of the locomotor system, with an incidence of 1.1~3.8% in China. It seriously affects the quality of our population and the healthy growth of children. The main manifestations of the affected children are shortened limbs, walking limp or swaying gait. Early diagnosis and treatment of congenital hip dislocation is essential to promote the development of the hip joint by restoring the normal alignment between the acetabulum and the femoral head in a timely manner. However, it is difficult for parents to detect abnormalities in infants and toddlers under the age of 1 year who are not yet walking. Therefore, careful clinical examination by clinicians is particularly important. However, early diagnosis should not be blinded, and further careful examination of the infant should be performed in addition to the appearance and skin pattern. To minimize the scope of X-ray examination. (1) Weak femoral artery pulsation: The femoral artery pulsation is weakened and the femoral triangle is empty due to the disappearance of the femoral artery lining after the dislocation of the femoral head; (2) Positive Allis sign: The child is lying supine with the hip and knee flexed, both feet are flat on the bed, and both ankles are seen close together with unequal knee height, which is due to the upward displacement of the femoral head. (3) Positive abduction test: The child lies flat on his back, flexes the hip and knee 90 degrees each, and the examiner holds the knee joint with both hands while abducting and externally rotating it, the lateral surface of both knees can touch the bed surface in normal children, if not, it means that the adductor muscle is tense, and the test is called positive abduction test. (4) Positive Ortolani sign: When the abduction reaches a certain level and suddenly bounces, the abduction can reach 90 degrees, which is called positive Ortolani sign. This method is reliable and is an important sign of hip dislocation, and is also an important examination method in the census of infants and children.