对于复杂政治经济舆论热点议题，中国国内媒体的报道方式会如何影响公众的政治 态度，本文以中国网民为调查对象，通过调查实验和统计的方法对中美贸易争端中的不 同媒体框架及其政治后果进行了实证的比较分析。研究表明：首先，采集自现实舆论中 的三种媒体框架都削弱了受众对美国的好感度，并激发其对贸易战的强硬态度。同时， 这些媒体框架还提升了网民对中央政府的政治信任。其次，不同的媒体框架产生的框架 效应之间差异并不明显，这显示民众在复杂议题上的认知能力有限。此外，年轻、教育 程度低、威权人格高、意识形态偏左的网民更容易受到媒体框架的影响，而普通民众的 政治态度比社会精英更为强硬。据此，本文认为在诸如中美贸易争端这类外交热点问题 上，目前官方的舆论工作取得了一定的预期效果，但是这种管控策略也存在一定的负面 影响，不仅会造成官方媒体公信力的流失，被激发的大众民族主义情绪也可能造就负面 的中国外交关系和国际形象。

The trade war between China and the United States began in 2018 has been a hot issue of public opinion in China. What are the political consequences of domestic media coverage and commentary on this issue? This paper conducts an empirical comparative analysis of different media frames and their political consequences in China–United States trade war using experiments and statistics. Three research results have been found: Firstly, the three kinds of media frames choose from real media reports can not only weaken the audience's preference for the United States, but also stimulate their hawkish attitudes towards US on the trade war issue, and increase their political trust in China’s central government. Secondly, no significant difference was found in framing effects between different media frames, which suggests that ordinary people's cognitive ability on complicated political and diplomatic issues is quite limited. Finally, young, poorly educated and those with high authoritarian personalities and left–wing ideologies are more likely to be in?uenced by media frames, while the political attitudes of non-elite groups are more radical than that of the elites. Based on empirical evidence, this paper argues that at least on issue of trade war, the CCP’s information control strategy on public opinion has succeed to a large degree. However, in the long run, this control strategy may undermine the credibility of official media, while popular nationalism stimulated by official propaganda may cause a negative impact on China's foreign relations and international image.