European Union was created for enhancing the cooperation and economic development of country members. This very complex initiative is a long-term process that contributes to reduction of inequalities due to the expansion of trade relations, increased mobility of factors of production and dissemination of technology and gradually added more freedoms between countries and common policies in this respect. Among the main objectives of EU are economic and social cohesion, which must be achieved mainly by promoting the conditions for economic growth and reducing disparities between the levels of development of EU regions, ensuring a high level of employment and a balanced and sustainable economical growth. The European Funds are the financial instruments of the common policies, being significantly diversified and improved in the last decades. The EU enlargement implied new challenges and higher efforts to support such common policies from a very limited common budget. For new members from Eastern Europe that joined EU, these European Funds were seen as a very important and reliable support for boosting their economic development. This paper will discuss, from both theoretical and empirical perspectives, the possible impact of these funds on the economic development, with a specific focus on the Eastern European Countries (EEC).