This paper introduces heuristic evaluation, which originated in usability engineering, into political communication research. Six criteria, including content, structure & navigation, visual design, functionality, interactivity, and overall experience, are constructed to assess the user interfaces design of political party web site. The WWW sites of Taiwan's two major political parties, DPP and KMT, are analyzed by the method of heuristic evaluation. The findings indicate the DPP WWW site is better than his counterpart in overall experience of usability. In addition, heuristic evaluation is compared with conventional methodologies in communication research. It is argued that heuristic evaluation is a powerful tool to identify usability problems in user interfaces, and also suited to evaluate events of election campaign.