【Objective】 To examine the status of the ultrasonic bone mineral density(BMD) of 0~3 years old children in Kunshan,and to provide evidence for early bone strength deficiency intervention. 【Methods】 The left tibia BMD of 813 children aged 0~3 years old no including who had bone metabolic illnesses were measured by quantitative ultrasound.The patients were divided into normal,mild,medium and severe groups of bone strength deficiency according to Z-score of BMD. 【Results】 The incidence rate of bone strength deficiency in girls(49.46%)was significantly higher than that in boys(34.47%),(χ²=16.82,P<0.01),while the BMD value had no statistical significance(t=0.41,P>0.05) between boys and girls.The BMD value increased with the age increase.The incidence rate of bone strength deficiency in children aged 42 days (50.91%) and 3 months (62.50%) was higher than the others,there was statistical significance(χ²= 28.36,P<0.01).The difference of BMD value had statistical significance (t=3.14,P<0.05)between city and town,while the incidence rate had no statistical significance(χ²=3.883,P>0.05).The difference of BMD value had statistical significance(F=11.92,P<0.01) among different grades of height evaluation.The incidence rate of bone strength deficiency in children whose height (weight) evaluation was upper or higher-middle was higher than the others.There was statistical significance(χ²=11.02,P<0.05) among different grades of height evaluation,while no statistical significance (χ²=6.68,P>0.05)among different grades of weight evaluation. 【Conclusion】 Children bone strength deficiency should be pay more attention,especially for those under 12 months.