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.