The purpose of this study is to understand the current degree of mobile phone addiction of Beijing residents and the factors that influence the degree of mobile phone addiction of Beijing residents. We surveyed 1756 permanent Beijing residents，and the data were tested by independent sample T-test，one-way ANOVA and other statistical methods. Results found：（1）Beijing residents’ mobile phone addiction is at a medium level，withdrawal behavior，highlight behavior，social comfort，negative influence and App updating are at a lower level，and App using is at a higher level. （2）The level of mobile phone addiction of Beijing residents is affected by demographic variables such as age，marital status，educational level，domicile place，monthly income level，number of children and subjective social class.