中文摘要：

随着移动智能设备和移动互联网的出现，移动社交媒介已日益成为人们网络活动和人际交往的新平台。为考察移动社交媒介使用行为、网络自我表露、网络社会支持和友谊质量之间的关系，本研究采用问卷法对473名青少年进行了调查。结果发现：（1）移动社交媒介使用行为会对网络自我表露和网络社会支持产生显著的直接正向影响，网络自我表露会对网络社会支持产生显著的直接正向影响，网络社会支持会对友谊质量产生显著的直接正向影响。（2）移动社交媒介使用行为可以通过网络社会支持的中介作用对友谊质量产生显著的间接影响，还可以通过网络自我表露和网络社会支持的链式中介作用对友谊质量产生显著的间接影响。

英文摘要：

Social media has deeply changed the interpersonal communication. With the popularity of the mobile Internet on the rise, and the appearance of mobile social media, the communication between people is changing rapidly. More and more young people started to use mobile social media to communicate with their classmates and friends. But few studies have focused on the adolescents＇ behaviors on using mobile social media activities and whether the use of mobile social media will affect the quality of their friendship, and how it will be affected. Studies have found that there is a close connection between the use of social media and adolescents＇ friendship quality. In addition to all the features of traditional social media, mobile social medial also has its own unique characteristics. It is convenient and can be used anytime and anywhere. How will the use of mobile social media affect adolescent＇s friendship quality, and what is the relationship between mobile social media and adolescent＇s friendship quality？ Further analysis and verification are still needed. Mobile social media refers to the traditional social media used on mobile devices （e.g., smartphones and pad）, and the software that had social features specifically developed for mobile devices, such as SMS, social networking sites, micro-blog, mobile QQ, and wechat. The current study examined the effect of mobile social media on the friendship quality of Chinese adolescents, and how such an effect might be mediated by online self- disclosure and online social support. The participants were recruited from four middle schools in Shanxi province and Anhui province. All participants were tested in groups in classroom settings. We recruited 600 students. They were asked to complete the Adolescents＇ Mobile Social Media Usage Behavior Scale, the Online Self-disclosure Scale, the Online Social Support Scale and the Scale of Friendship Quality. There are 560 students who completed the survey （i.e., response rate was 93.3%）, with 473 students using