在这个科技飞速发展、社会革新日新月异的时代，新媒体生力军微博客应运而生，它的产生和发展带来了全新的新闻信息传播体验。微博基于网络人际传播的传播模式打破了时空限制的壁垒，并逐渐成为突发事件传播的舆论中心。突发灾难性事件的袭扰，会给以人类为中心的社会造成强烈的影响，作为社会的瞭望者，每一次重大突发事件，媒体都会参与其中，是否能对突发性灾难事件的发生和发展做到全方位、全角度、全覆盖的报道，对于新闻媒体来说，既是机遇也是挑战。微博自出现以来，其传播功能逐渐从最初的社交功能中发展和凸显出来，特别是在进入突发灾难事件传播视域之后，逐渐担当起不可忽视的媒体作用。在突发灾难事件报道中，微博通过人际交流互动参与到事件发生发展结束的始末，基于人际传播功能的媒体作用得到充分的发挥，并对社会决策层面起到了积极的影响作用，推动了危机的妥善处理。微博对于突发灾难性事件的报道有力地提升了决策部门危机处理能力，更好地发挥了公众舆论缓释作用，并积极地推进了媒介融合态势。同时新媒介环境下的突发灾难性事件报道也促进了微博传播的日益完善，为其发展提供了难得的契机。随着公众传媒素养的不断提升和媒介环境的优化，微博在突发灾难事件报道中基于人际传播的媒体作用将拥有更大的发展空间。

Over the recent years, along with the global climate changes, natural disasters and human foes frequently happen in the world. Tsunami, earthquake, volcanic eruption, flood, airplane crash，stampede，fire and explosion occurred from time to time in 2010. Whether a certain media can provide an overall and full-angle report of unexpected disasters places not only opportunity but also challenge to itself. Soon after the born of microblog, its communicational function emerged from social functions especially by playing important roles in unexpected disasters reports. Based on interpersonal communication, its media potential is fully tapped by actively affecting public administration and pushing unexpected disasters to be resolved properly. Reporting of unexpected disasters on the other hand provides precious opportunities to the development of microblog. Its media roles in unexpected disasters reports are sustainable through continuously promoting crisis solving abilities of public administration; slow release of public opinions and accelerating convergence media pattern. Microblog enjoys more future advancements in its roles of unexpected disasters reports. As time past by, its media roles will be deepen and expanded in the existing media pattern.