歐洲整合創建了許多與傳統國際法相當不同而獨特的法律體系，由歐盟成員國將部份主權讓渡給歐盟來看，歐洲聯盟已俱有跨國政治架構的性質，但歐盟作為一跨國政治架構，其決策機制卻是非民主的。為了要促使歐洲整合更進一步，彌補此一民主缺陷成為首要課題，歐洲憲法的制定也在這樣的背景底下被提出來，試圖透過歐洲憲法的確立，來建立歐盟公民與歐盟間的直接關係與民主的決策機制，但歐洲憲法卻也帶出了這將使歐盟朝向聯邦國家的方向發展的疑慮。 換言之，憲法概念可分成兩個種面向：保障基本人權與國家成立之辦法。也因為歐洲整合還是一場持續進行的活動過程，因此釐清憲法概念有不同的兩種面向也就能更清楚了解歐洲憲法對歐洲整合之影響。面對歐洲憲法條約的被否決與里斯本條約的簽訂，憲法兩字雖被懸置，但憲法概念能否發揮其作用也將影響著歐洲整合對民主缺陷的解決與突破。 European integration has created a quite different and unique legal system, compared with traditional international law. European Union has had the transnational political framework, in other words, the member countries of European Union have transferred part of their sovereignties to EU. But the EU as an transnational political framework, its policy-making institution is non-democratic. In order to promote European integration further, to correct the defect of democracy as the most important issue, and the formulation of the European Constitution also under such a background, trying to establish the direct relationship between the citizen in EU and EU itself and setting up democratic policy-making institution. But the European Constitution but also to bring out this will enable the EU towards the direction of development of the federal state concerns. In other words, the concept of constitution can be divided into two kinds of approach: the establishment of protection of fundamental human rights and national approach. But also because the process of European integration is an ongoing activity, to clarify the concept of constitution have two different approach will also be able to more clearly understand the impact of the European Constitution European integration. Face of “the European Constitutional Treaty” rejected and “the Lisbon Treaty” signed, the word of constitution had been suspended, but concept of constitution whether to play its role will also affect the solutions and breakthrough of the democratic deficit in European integration.
