本文研究了微博新闻对社会问题的追溯现象，即原本作为新闻背景的社会问题素材，在经过微博一系列发布、转发和评论后，在关注度上逐渐取代了最近发生的新闻，成为新的关注点。本文认为，微博的角色引导力推动了追溯的实现。微博新闻的传播特点助推了追溯现象:微博传播中“沉默的螺旋”被拉直，为追溯的实现提供了便利；议程设置呈现出新特点，为追溯的实现提供了条件；微博新闻把关人的自我管理相对缺失，为追溯管道疏通提供了渠道。微博新闻对社会问题的追溯的现实意义在于：展示了舆论自由的正向作用；强化了对政府相关部门的监督和问责；弘扬了正确的社会价值观。

This paper exploring the traceability of Micro-blog News to social issues that: as the original news background of social issues, after through the release, forwarding and comments, get more attention and gradually replaced the later-day news, so that to become the new focus. By analyzing the typical case, the authors conclusionas follow: Firstly, the guiding force of Micro-blog roles promoted the trace back implementation; Secondly, the communication feature of Micro-blog news push thetraceability; As the "spiral of silence" is straightened to provide convenience for therealization of trace back; As agenda-setting was update to provides the conditions for the realization of trace back; As the lack of self management gatekeeper provides the channel for trace      back pipeline dredge. There are important  realistic signi?cances of micro-blog news traceability: Display the positive role of freedom of opinion; Strengthen the supervision and accountability to the related government departments;Promote the correct social values.