Hip dislocation is a common condition in pediatric orthopedics and can have residual sequelae if not treated in a timely manner or not treated properly. Previously, most children were seen with a limp, and the diagnosis of hip dislocation was clarified by X-ray examination. Most of the children needed surgical treatment. The treatment period is long, the cost is huge, the child is in pain, the efficacy is poor, and there is a possibility of sequelae. With the application of ultrasound technology in the diagnosis of hip dislocation, the diagnosis of the disease can be greatly advanced, and children can receive early and timely treatment. At present, more than 70 countries around the world have adopted the policy of neonatal hip ultrasound screening, and a large number of neonatal hip developmental abnormalities have been diagnosed and treated at an early stage. This technology has also been gradually popularized in large coastal cities in China. Since the development of ultrasonic diagnosis of hip dislocation technology, a large number of children with hip dislocation have received the most timely treatment. The earlier the disease is detected, the easier the treatment and the better the effect. At present, children with hip dislocation aged less than 6 months are mostly treated with Pavlik sling or soft support; children older than 6 months need frog support or plaster treatment, and early treatment avoids surgery. Most early cases have a good prognosis. To achieve early diagnosis and treatment, parents and doctors need to work together. If you find that your child has the following conditions, please go to the orthopedic department in time: 1. Asymmetry of thigh or buttock lines on both sides. 2. “Popping” of the hip joint when urinating. 3.Low movement of one limb. 4.Both lower limbs are not equal in length. 5.Crippling when walking. The key to successful treatment is early diagnosis and treatment.