Objective To follow up the intelligence and physical development of 156 infants borne from PIH mothers; to study the measures to improve their ntellectual development and provide basis for the management fo the infant from PIH partiuents. Methods By using the physical intelligential development investigation table we followed up the intellectual and physical development of the infants in PIH group and the normal group at the age of one, two and three years old. Results There were significant differences between PIH gr development ( P