中文摘要：

Web2.0时代以来，微博成为用户分享、传播和获取信息的重要平台。然而，在以往的研究中，对微博上用户原创信息分享行为的研究较少。本文基于冲动行为的视角，引入认知情绪理论，以新浪微博上突发事件信息微博为例，构建微博原创信息分享行为的理论模型，并运用结构方程模型的研究方法进行实证分析。研究结果表明，用户对外部环境的感知对情绪和微博原创信息分享均有显著影响，其中，情绪在两者之间起着中介作用。本文研究结果不仅为微博上用户原创信息分享的影响因素研究提供了实证依据，同时，对政府应急管理决策和微博运营商具有一定启示。

英文摘要：

With the development of Web 2.0, Microblog has been the important platform of information sharing, diffusing and acquiring. However, there were few studies about user-generated information sharing in the past. Based on the impulsive behavior and the cognition emotion theory, we build and empirically test a research model of breaking news sharing in Microblog with the structural equation model. The results indicate that the perception of external context significantly influences people＇s emotion and urge to share breaking news information in Microblog. The findings contribute to both theory building in the sustainability of Microblog and practice in the emergency management system for decision- making.