The study of the evolution of growth rates and that of economic development in an open economy is constantly attracting the interest of researchers and practitioners, as it presents results that differ and diverge. This discrepancy is, somehow, modelled on the adoption and implementation of policies of economic openness abroad, which depend mainly on political will, but also on a set of parameters such as the social structure, the economic situation, as well as the industrial fabric and natural resources. While economic openness is the core of economic strategies for many countries, it remains reluctant in other countries. Morocco, like many developing countries, has established a policy of economic openness, characterized by the promotion of trade, the encouragement of inward and outward foreign investment; and diversity of partners, etc. Nevertheless, the achievements of this openness remain to be evaluated. This work aims to analyze the relation between growth and FDI among the theoretical contributions as well as the empirical works dealing with the impact of the openness to growth via Foreign Direct Investments as a transmission channel to the positive benefits of the openness, on the economic growth in Morocco, , and to assess the impact of this economic openness, on the evolution of economic growth through the FDI channel, using empirical verification with Vector Error Correction Model. the results show a small positive impact of FDI on the economic growth on the long run.