Objective To evaluate the significance of early screening and intervention of developmental dysplasia of the hip (DDH) in infant in primary child health. Methods In adminster districts 2 519 children at age of 1 to 3 months were taken hip special physical examination.A total of 801 infants with positive check-up signs were examined by hip ultrasound with Graf's method.The screening results were analyzed. Results A total of 59 cases of DDH were detected in 2 519 infants with the morbidity of 2.34%;The DDH of male were 10 while female were 49,with obviously more female than male;The two clinical examinations had the biggest significant if they were combined. Conclusion DDH early screening in primary child health care has very important significance in striving for the optimal timing of correction and treatment for the disease.