目的了解北京籍大学生体质指数(BMI)变化趋势。方法对2002—2009年某北京市高校6 030名北京籍入学新生进行身高、体重检测。结果 2002—2009年男生身高均高于172.2 cm,女生身高高于161.2 cm。BMI<18.5 kg/m2的低体重学生比例从2002—2006年呈逐渐下降趋势,此后开始升高,截止2009年低体重男生为31.8%,女生为28.4%。自2005年学生超重和肥胖率下降,男生超重和肥胖率高于同期女生。结论北京市大学生超重和肥胖率开始出现下降趋势,但仍然高于全国平均水平。低体重率开始上升,正常体重学生比例仍然较低。 Objective To understand the changes of body mass index (BMI) of Beijing college students. Methods The height and weight of 6 030 Beijing freshmen from a university in Beijing from 2002 to 2009 were tested. Results The boys’ height was higher than 172.2 cm in 2002-2009 and the height was higher than 161.2 cm in girls. The proportion of underweight students with BMI <18.5 kg / m2 showed a gradual downward trend from 2002-2006 and then started to rise. As of 2009, the proportion of underweight male students was 31.8% and that of female students was 28.4%. Since 2005, students’ overweight and obesity rates have dropped while their overweight and obesity rates have been higher than those of their counterparts over the same period. Conclusion The overweight and obesity rates of undergraduates in Beijing began to show a downward trend, but still higher than the national average. Low birth weight rate began to rise, the proportion of normal weight students is still low.