The leader of the National Development and Reform Commission can be called the director or the director, depending on the specific position and occasion. In the internal or formal occasions of the National Development and Reform Commission, people will address leaders as directors to show respect and formality. In some informal occasions or foreign exchanges, people will address leaders as directors, so as to simplify the address and express intimacy. Therefore, the leadership of the National Development and Reform Commission should be called director or director, depending on the actual situation.