With the rapidly developing technology worldwide，the communication distance between individuals has begun to shrink. One of the most important development in the field of communication technology is the mobile phones. Mobile phone is a double-edged sword for young adults. Despite its advantages of convinience and practicability,excessive use has been associated with potential risk in people's life.
Her study is to reveal the biderectional relationship between problematic mobile phone use and depressive symptoms in Chinese undergraduated students through time.