The purpose of this article is to focus on the following theme while conducting a research on Xunzi's theory of emotions. Even in Asian philosophy, there have been some theoretical attempts at constructing an agent of moral subjectivity by way of rational speculation. In Xunzian philosophy, rituals are a means of controlling human emotions. Thus, some may argue that emotions so controlled in such rituals as an external mode of control may be construed as imbued with passivity and something that awaits only to be edified and reformed. Notwithstanding this line of rebuttal, however, the author's position on Xunzi in connection with role of human emotions in process of self-cultivation is that the reason itself may not be compelling enough to motivate an agent. Instead, the author believes that "practical emotions" based on spontaneity and as a motivational impetus, should be accorded a much more enlarged role in connection with any motivational action which is subject to morally motivated will power. Construed this way are the emotions as indicative of momentum of mind in exploring the motivational structure underpinning any moral action. In light of this, the author believes that this line of concept of emotions is grounded in Xunzi's theory of emotions. While reviewing thoroughly the theory propounding that the development of thought of Xunzi is in fact based on the thoughts and notions of Confucianists since the time of Confucius as shown in the cases of "Xing ze ming chu(Human Nature originates from Mandate)"of the Guodian bamboo slips, this article will illuminate the commonality between Xunzi's position on emotions and some issues on "emotions" as revealed in Guodian bamboo slips. They began describing "naturalness" of emotions as an important subject matter. In describing the relationship among the Heavenly Mandate, "xingqing," "rendao", "emotions" were described as imbued with a feature thought to possess pro-active tendency and empirically oriented procilivity. Furthermore, in their theories of human nature, they also revealed the role of "emotions". Among studies on Xunzian theory of emotions, this type of study which illuminates the philosophical genealogy, including philosophical genealogical studies based on the Shanghai bamboo slips and the Guodian bamboo slips.