This thesis aims to understand the reason of Saudi Arabia‘s intervention in Yemeni conflict in 2015. Yemeni conflict is the continuation of internal conflict but heated by the Arab Spring in 2011 and reached the peak in 2014-2015. This research uses the qualitative method. Data is analyzed by first processing and then displaying in to be explored more using qualitative method. Using the instrument of geographic and political element of international context in decision making process and the concept of Responsibility to Protect (RtoP), the result of this research shows that Saudi Arabia conducted intervention by several reasons. The close relation between Yemen and Saudi Arabia in terms of geography and politic is highly influencing the decision. The increasing humanitarian crisis and the failing state of Yemen also encouraged Saudi Arabia to intervene under the principle of Responsibility to Protect.