There are many factors that can associate with smartphone addiction, and personality traits are included. With the popularity of mobile phones, smartphone addiction has become increasingly common. To differentiate the association between various personality traits and smartphone addiction, a survey was conducted in northern China (mainland). With the help of bivariate analysis and regression analysis, three conclusions could be drawn. To begin with, there is a negative association between Honesty-Humility (H-H)/Agreeableness (A)/Conscientiousness (C)/Openness to experience (O) and smartphone addiction, whereas there is a positive association between Emotionality (E)/eXtraversion (X) and smartphone addiction. Secondly, Emotionality, Agreeableness, Conscientiousness and Openness to experience could explain a 27.14% variance in smartphone addiction. Thirdly, Emotionality, eXtraversion and Agreeableness more significantly predict smartphone addiction than the other three personality traits.