Apart from the United States, Europe is the main arena of Taiwan’s foreign affairs. However, due to the absence of normal diplomatic relations, parliamentary diplomacy has gained an unusual degree of importance. The Ministry of Foreign Affairs in Taiwan has actively encouraged mutual visits of parliamentarians from both the legislative Yuan and EP(European Parliament). Through these means, the development of relations between Taiwan and the EU has been fostered. From the interaction of parliamentarians from both sides, we are able to discern the key role played by the EP-Taiwan Friendship Group in enhancing relations between Taiwan and the EU. Based on the Group of the European People's Party and Democrats, the EP-Taiwan Friendship Group is an unofficial organization whose 208 members come from 27 member states of the EU. In order to clearly outline the importance of the EP-Taiwan Friendship Group in the development of relations between Taiwan and the EU, we have compiled related resolution documents and have analyzed in detail the process of promoting the resolutions. From this research we conclude that the EP-Taiwan Friendship Group has accomplished the resolutions in favor of Taiwan through a process of “Two Approaches and Four Stages”. Taiwan’s attainment of observer status in the WHA during May of 2009 is due in no small measure to the contributions of the EP-Taiwan Friendship Group. It is asserted here that the EP-Taiwan Friendship Group delivers four means of promoting relations between Taiwan and the EU. Namely, the Group constitutes the principal driving force for allowing Taiwan's participation in international affairs; it stands as an important platform for diplomatic lobbying of Taiwan; it is an accelerator of favorable policies towards Taiwan; and it forms the cornerstone of relations between Taiwan and the EU. Consequently, Taiwan's government should further intensify contacts with the EP-Taiwan Friendship Group to promote the development of relations between Taiwan and the EU.