語言是人類重要的溝通工具，其目的是用來傳達思想、交流觀念和意見等，故語言除可傳承各民族特有的文化、教育和藝術資產外，完善的多語政策，更有利於各民族互相尊重以減少紛爭。歐盟於1973年至2007年歷經了6次擴大，自2007年加入羅馬尼亞和保加利亞後，會員國從6國增加至27國，語言的多樣性不僅包含23種官方語言，亦包括60多種區域與少數語言；本研究除探討歐盟東擴後所產生60多種區域與少數語言對歐盟的重要性外，並以此為例，研究歐盟多語政策下，如何有效保護境內區域與少數語言，以達最終整合目標。 / Language is an important tool for human communication, which aims to covey concepts, exchange ideas and opinions. In addition to passing down unique cultures, education and art assets, language can educate people to show mutual respect so as to reduce conflicts differences. From 1973 to 2007, the European Union experienced six expansions. Ever since Romania and Bulgaria joined EU in 2007, Member States have increased from six countries to twenty-seven countries. Linguistic diversity includes not only twenty-three official languages, but also sixty kinds of regional and minority languages. This study is to pinpoint the important influences these sixty regional and minority languages have brought to EU since the expansion. Take EU multilingualism policy as an example to better understand the ways to protect regional and minority languages in order to reach the goal of final integration.