Hip dysplasia is characterized by asymmetry of the hip stripe, unequal limb length, abnormal gait, and hip pain. Hip dysplasia early will find hip stripe leg stripe asymmetry, the affected side of the skin stripe to the perianal side of the posterior extension. If there is hip dislocation both lower limbs are unequal. Lower limb activity is impaired, lower limb activity popping. Some will have hip dislocation and walk with a limp. Hip abduction activity is limited. Hip joint adduction deformity and pain. Posterior hips, anterior lumbar lordosis, if combined with both sides of the hip joint dislocation appear walking duck step. Hip dysplasia will gradually aggravate with age, go to the hospital after birth to do physical examination, imaging examination, need to go to the hospital orthopedics examination, clear diagnosis and early treatment.