This undergraduate thesis raised the topic of the process of Turkey's membership in the EU which started with membership negotiations on October 3, 2005. In this thesis takes the point of view of the European Union to explain the decisions of the EU Turkey membership application has not received until 2016. Turkey accession process is very slow, it is affected by the preferences of EU member states are opposed to Turkey's membership in the European Union. In addition, the dominance of French and German preferences (Franco-German) in the intergovernmental level negotiations. So the decision of the EU Turkey membership application-related based on the results of bargaining and strategic negotiations between Governments, in which Member States with a greater capability of structurally like (economic, population, geography and military) would tend to have a greater opportunity to gain political power