The Study Of Cyclical Effect Between College Student’s Depression、stress And Internet Addicion

College students are the pillars of society, college students are one of groups concerned by the society, but there are a lot of college students drop out of school due to Internet addiction each year, internet addiction has great influence on individual and society. so it has important and realistic social significance of researching progressive relationship between depression、stress and internet addiction.There are three aspects about internet addiction in this paper. Building cyclical effect between depression and internet addiction, As well as the moderated effect of family function and the moderated mediating effects of interpersonal relationship. The empirical analysis shows that the circulation effect model can reflect that depression can predict internet addiction and internet addiction can significantly predict depression.Building cyclical effect between pressure and internet addiction, As well as the mediating effect of anxiety and the mediated moderating effects of self-coping styles. The empirical analysis shows that the circulation effect model can reflect that stress can predict internet addiction and internet addiction can significantly predict stress.When we solve the cyclical effect model, we proved that the parameter estimates with the ordinary least squares method are inconsistent, the two stage least squares estimator is a consistent estimator.