In political communication research, intermedia agenda-setting theory can well explain the mobility of agenda between new and traditional media and its structural in?uence in the campaign, but few studies tested it in social movements. The ‘Anti-trade Student Movement’ happened in Taiwan 2014 provided a good case. By time-lagged analysis, the results support the intermedia agenda-setting effects between traditional and social media in the situation of social movement. The agenda-setting ability of social media is mainly to provide the topic resources and ‘resonance effects’ at the beginning of the movement, while traditional media still have influence on social media by the process of framing. This results challenge the mobility model of news agenda found in political elections. When social movement actors adopt social media mainly as a tool for resource mobilization, they may have less motivation and ability to take control of issue framing than the traditional political-biased media, which means new media and online public opinion are still in a hazard of manipulation by partisan ideologies.