This paper overviews sophisticated triangular relations among Taipei, Beijing and Washington after 2000. Then, it scrutinizes the development of US mediation as a form of third-party intervention in such complicated dynamics in the Taiwan Strait. The pattern of contemporary US mediation is studied in an analytical way. Then, it analyzes the role and approaches (strategies) of the US in mediating between the ROC and the PRC, as well as evaluates preliminarily the future of US mediation. Some key findings include, for example: the US is gradually moving towards the role of real mediator in the cross-strait dispute, the characteristics of the US itself and the environment are positive forces driving further effective US mediation, as well as the US will continue to play a mediating role throughout the George W. BushÂ’s presidency but has to be cautious of the effectiveness of its mediation and the differences between Taipei and Beijing in order to find a useful way to enhance the understandability and acceptability of its official position on the peaceful resolution of the cross-strait sovereignty dispute. ..PAT.-Conference Proceeding [ABSTRACT FROM AUTHOR]