The paper is aimed to integrate the existing research on executive coaching which is developed rapidly all around the world in the last few years. At the same time, with Delphi Technique, the paper develops and justifies a coaching competency component for executive. For better outcome, we take coaching experts and executives with business coaching experience as the target and conduct Modified Delphi survey twice. The survey depends on 5 coaching competency clusters and 47 individual competency items formed in a theoretical background. At the first Delphi survey, we derived some modified questions for the panel to answer and did some research on those answers and advice we got. Finally 5 coaching competency clusters and 37 individual competency items were formed. At the second survey, we decided those 5 competency clusters and 34 competency items as the final version, which is suitable for CEO and executive in managing situations. With the result we developed Coaching Competency for executives and HR, which is used to develop the leadership competency, improve management abilities and achieve more organizational outcomes and business objectives. At the same time, this research will provide effective options to them, and also create a meaningful point of view to the area of executive coaching.