Ensuring sustainable growth of the Slovak Republic is not possible without effective state investment policy. The most important pillar of the analysis by investors is protection (guaranties, insurance) of investments. The research was based on analysis of main protection institutes of investments in Slovak Republic and member states of the European Union for example: multilateral and bilateral treaties on protection of investments, fair equitable treatment, full protection and security, non-discrimination standards, national fonds guarantying investments, government guaranties and international, european and national legislation on investments, protection of investments by arbitration courts. Chosen decision of courts were subjects of analysis, their interpretation and common consent of their application. Base on research, the author proposed de lege ferenda for more effective legislation in investments and sustainable economic growth.