1. Pain on the affected side: the pain can be intermittent or continuous, with no symptoms when intermittent, but intermittent for up to a year or more. It is aggravated after walking activities, sometimes for rest pain. The pain is mostly pins and needles, dull pain or soreness and discomfort, often radiating to the groin area, inner thigh, posterior hip and medial knee, with numbness in the area, but sometimes the pain point cannot be found. 2, joint stiffness and restricted activities: the affected hip joint flexion and extension is unfavorable, squatting is difficult, can not stand for a long time, walking duck walk, the hip joint makes a loud sound and even accompanied by leg belly cramps. Early symptoms are abduction and external rotation activities are limited. 3.Crippling: progressive short limp, due to hip pain and femoral head collapse, or late onset of hip subluxation. Intermittent claudication often occurs in the early stage, and is more obvious in children. 4. Skin temperature: The skin temperature of the affected hip is lower than the normal temperature, and the affected limb is cold in individual patients. 5.X-ray manifestation: thin or interrupted bone texture, cyst, sclerosis, flattening or collapse of the femoral head.