Abstract: Objective To understand the addictive behavior of left-over middle school students and common ones in Xiangxi Autonomous Prefecture and to study its influential factors,and to provide a reference for carrying out health education.Methods A total of 2 251 middle school students (1 124 of left-over middle school students and 1 127 of common ones) randomly selected from Xiangxi Autonomous Prefecture were investigated by questionnaires about their behaviors of long-time Internet surfing,Internet addiction and long-time video game.Results More female common middle school students (13.69%) were reported of having long-time Internet surfing than female left-over ones(7.19%);more common junior students (18.84%) were reported of playing long-time video game than left-over junior students (11.96%);more common high school students (18.07%) were reported of playing long-time video game than left-over high school students(12.59%);more rural common middle school students (9.59%) were reported of having internet addiction than rural left-over ones(6.21%).The differences were of statistical significance(P<0.05).According to Logistic Regression Analysis,the risk factors of internet addiction among left-over middle school students were male students,game-oriented internet,always unhappiness(OR=6.452,1.850,3.263,3.045,P<0.05);the risk factors of internet addiction in common middle school students were male students,from single-parent family,frequent or always unhappiness and having a father graduated from junior and senior high school(OR =2.400,2.558,4.801,1.794,2.582,P<0.05).The protective factor was having an academic record on an average level(OR =0.246,P=0.001).Conclusion Common middle school students are easier to become addictive than left-over middle school student.Common middle school students should be guided to a proper use of computer and internet to control the internet time.And the related health education should also be actively carried out.