中文摘要：

转型期的中国，群体性事件频发，底层群体期待通过媒体表达利益诉求，但囿于客观体制框架的限制，大众传媒往往对底层需求习惯性过滤。在传统媒介生态背景下，微媒介的特性恰巧弥合了体制内困境，衍变成新时期底层群体媒介使用图景，组织行为在群体心理的驱使下呈现出趋同的微媒介依赖。在此种语境下，底层群体对微媒介的依赖实质上更是一种心理上的群体趋同和行动上的突围预备。试图依托媒介依赖理论，通过对心理认知的层级叠加，厘清底层群体在事件进程中的媒介使用动因，勾勒出群体性事件视阈下底层群体微媒介使用心理的学理性框架，并关注在微媒介使用过程中的失范行为，进而考量其异化行为的纾解机制。

英文摘要：

During the transitional period,the group events are taking place frequently,and the people from the social bottom look forward to expressing their appeal through media. However,due to the restraint of the objective institu-tional framework,mass media tend to filter their appeal. In the traditional media environment,micro-media happens to mend the defect of the present system and form a new vision of the media application for the underclass. In this context,we believe that the underclass’s dependency on micro-media is actually a club convergence in mentality and a preparation in action. This article tries to clarify the motivation of the underclass’s using media and sketch out the psychic frame of micro-media application. In addition,we are concerned with the anomic behavior in the process of micro-media application and investigate the alleviating mechanism of alienated behavior.