Abstract: Dual communication spaces, both official and public, are considered to be the most significant characteristics in China's online political communication. Based on content analysis and frame theory, the research chooses four political internet events, trying to test six general frames(fact frame; conflict frame; responsibility frame;suggestion frame;morality frame and human interest frame)and three theme frames(political behavior; political judge; political development). The study uncovers multiple differences and limited interactions when both spaces frame themselves in political issues. Especially in factual level, public space is capable to construct their own words and frames, which also can set the agenda to official space. In action level, it only finds out comparatively limited interactions between two spaces.