【目的】了解婴幼儿骨强度现状,探讨影响婴幼儿骨强度的相关因素。【方法】用定量超声仪对1729名婴幼儿进行骨强度测定并进行相关因素问卷调查。【结果】1091名(63.1%)婴儿的骨强度在正常范围,骨强度减低者以轻度为主,影响婴幼儿骨强度的因素为性别、年龄、是否服用维生素D及钙剂、喂养方式、有无佝偻病症状体征。【结论】婴幼儿骨强度大多数在正常范围,临床应重点关注小年龄婴儿,及时适量补充维生素D和钙有利于提高婴幼儿的骨强度水平。 【Objective】 To understand the status of infant’s bone strength and to explore the related factors that affect the strength of infant’s bone. 【Method】 1729 infants and young children were tested for bone strength by quantitative ultrasound and related factors questionnaire. 【Results】 The results showed that the bone strength of 1091 infants (63.1%) were in the normal range, and those with decreased bone strength were mild. The factors affecting infants’ bone strength were gender, age, vitamin D and calcium intake, With or without rickets symptoms and signs. 【Conclusion】 The majority of infant’s bone strength is in the normal range. The clinic should pay more attention to the infant of small age. The prompt and proper vitamin D and calcium supplementation can improve the bone strength of the infant.