目的　了解中学生成瘾行为流行状况。　方法　随机整群抽取三类中学初一至高二学生 165 0人 ,自填问卷。　结果　该区中学生目前吸烟、饮酒、网络成瘾率分别为 10 .3 %、3 1.0 %和 12 .2 % ;各成瘾行为发生率男生高于女生 ,高中生高于初中生。　结论　应针对中学生性别和年龄特点尽早进行健康和生活技能教育 ,减少成瘾行为对青少年健康的危害 Objective To understand the prevalence of addiction among middle school students. Methods A total of 165 0 first-year, second-year students from three types of middle school were randomized and randomly selected. Results The prevalence rates of smoking, drinking, and internet addiction among middle school students in this district were 10.3%, 3.01% and 12.2% respectively. The prevalence of addicts was higher in boys than girls and in high school students than in junior high school students. Conclusions Health and life skills education should be conducted as soon as possible according to the sex and age characteristics of secondary school students so as to reduce the harm of addiction to the health of adolescents