Through 400 high school students assessed with coping styles questionnaire and Internet Addiction Impairment Index, it explores the relationship between coping styles and Internet Addiction Disorder of high school students. The difference of the scores of Internet Addiction Impairment Index between the male and the female students is significant. In terms of the scores on the Internet Addiction Impairment Index, the participants can be assorted to three groups. The differences on scores of fantasy, self - accusation and retreat between groups are significant. By stepwise regression, the fantasy and retreat factors can enter the equation. The coping styles of fantasy and retreat can better forecast and explain the internet addiction disorder.