The emotions play so important roles in moral motivation among Mencius' contexts. Moral emotions contain moral cognition, at the same time, emotions are engaged in moral reasoning. There is an emotionrational structure in Mencius. In the interpretations of debate between Mencius and King Xuan, there are emotions in King's moral reasoning in affirmative theory, but negativists think no emotional relation to reasoning. So I try to make four defenses for emotionism: 1. Is there a contradiction in emotion theory of Mencius? 2. How is sympathy pushed to the other? 3. Is Mencius a motivational Internalist? 4. How emotionrational structure to operate?In short, the conclusion is no separation between emotion and reason in Mencius' moral theory.