【Objective】 To analyze Yangzhou infants' intellectual development,provide a scientific basis of promoting the infants's early intellectual development. 【Methods】 5 635 infants who acceppted physical examination in our clinic in Yangzhou were recruited to Develpmental Screening Test(DST).The data were used to analyze on infants' intellectual development. 【Results】 1) The survey found that the development quotient(DQ) of infants was 87.59±12.24;5.8% and 34.1% infants' were abnormal and suspicious in DST;2) Girls' DQ was higher than boys';18 months,30 months and 24 months baby were found the top three abnormal in DQ.3)The retardation ratio were 40.7%,38.0% and 32.0% in sports,social adjustment and mental. 【Conclusions】 Infants' intellectual development were in general level in Yangzhou.More Develpmental Screening Test need to be done on 18~30 months babies and more intervention and guidance on ports ability retardation are needed.