Egypt has rejected the construction of Grand Ethiopia Renaissance Dam (GERD) on the Blue Nile in Ethiopia. GERD was launched unilaterally by Ethiopia. The GERD will be largest dam in Africa which can storage huge amount of water. Egypt sees GERD as a threat to their stability because it has a capability to control the Nile water flow to Egypt. In Ethiopia perspective, the dam would not cause harm to Egypt’s Nile water share. Still, Egypt believes that the dam would negatively impact the country’s water share from the Nile. The question emerged in this research is why did Egypt reject the GERD in Ethiopia. The objective of this research is to analyze the reason of Egypt rejection toward Grand Ethiopian Renaissance Dam (GERD). Furthermore, the method that was used by the writer was qualitative method by using secondary data such as article, journals, e-news, e-book and other literary sources. As the findings, from analysing the perspective of Egypt and Ethiopia this research found that there was possibility of the share of Nile water to Egypt will reduce and that will affect to Egypt stability. Other than that is the economic interest of Egypt over Nile water as supporting factor.