This study was qualitative research based on document analysis. The overall study objective was to evaluate the role of Thai PBS during Thai political protests. The methods of gathering qualitative feedback of the Thai PBS audience were from email, facsimile machine and telephone during 4-21 May, 2010, during the most intense period of Thailand’s political crisis. The findings were analyzed with the concepts of Functionalism, Uses and Gratifications, Crisis Management, Public Broadcasting Service, and Media Ethics. The results, from the audience’s point-of-view, showed that the four roles of the Thai Public Broadcasting Service (Thai PBS) during the political crisis were: 1.the guardian, 2.the public service provider, 3. the constructor of meaning, and 4.the respondent.