Objective To learn the hip development of infants within six months in Xinjiang Ili state and the detection rate of ultrasonography in infant developmental dysplasia of hip(DDH),investigate the epidemic factors of DDH and provide guidance for early interference. Methods From April,2011 to April,2012,1 862 infants within six months in our hospital(totaling 3 724 hips) were examined by regular physical examination and ultrasound screening.The epidemic factors of DDH were studied and at the same time,the exceptional cases were intervened with individualized treatment. Results 37 exceptional cases of hip dysplasia were examined by ultrasound screening(totaling 50 hips),with a 1.3% DDH detection rate.The incidence rate of baby girls was higher than that of baby boys,in a proportion of 2 to 1.The DDH detection rate of Kazak and Uyghur nationality was significantly higher than that of Hui and Han nationality (4∶1).All the patients of various types recovered after timely and individualized treatment. Conclusion DDH morbidity varies with different gender and nationality.Babies whose legs are wrapped after birth tend to have hip dysplasia.Earlier screening for infant hip development can prevent against pathogenic factors thus will have great significance on earlier individualized intervention treatment.