Due to the weak resistance of children, it is easy to get some diseases, at the same time, due to the poor language expression ability of children often misdiagnose some diseases. For example, pediatric femoral head necrosis. Due to misdiagnosis and untimely treatment, necrosis will develop further, and in severe cases, acetabular destruction and dislocation of the femoral head will occur and cause disability. This not only brings us difficulties in treatment, but also brings great pain to the child’s psychology, and even affects the child’s life. Therefore, parents need to observe it carefully in time to realize early detection, early diagnosis and early treatment. Pediatric necrosis of the femoral head is more common in boys than in girls, with a male-to-female ratio of about 4:1. It mostly occurs in children aged 3 to 12 years old, with the highest incidence at the age of 6 to 8 years old. Secondly, it often occurs in children with history of hip trauma or history of taking hormone drugs. Necrosis of the femoral head mostly occurs in the left side, single hip is involved, 15% occurs in both hips. Fourth, there is a family history of genetic predisposition, about 30% of the affected children’s immediate family members have the same disease. Developmental delay, height is shorter than normal children of the same age. Early manifestations of pain in the groin area, inner thigh, hip, knee or lumbosacral region, pain aggravated by walking for too long or running and jumping, alleviated after rest. Muscle spasm, obvious limitation in abduction and internal rotation, mild atrophy of hip and femoral muscles. Deep gluteal lines and unsteady gait. In the late stage, due to the collision of the flattened femoral head with the acetabulum, “embedded” abduction is produced, accompanied by coldness of the lower limbs. Parents are reminded that once a child is found to have these symptoms, early medical attention must be sought to prevent serious consequences.