In the paper we try to put Mencius cultivate moral energy (yang-qi) on the background of ancient jing-qi-lun. (raise spirit-vital power) My purpose is to clarify the confusions rise from Mencius yang-qi, including the role of mind and whether intellectual should commit their entire life to fulfill political ideal as only possibility. I dig imply meaning from the text exist before 221B.C. to compare with Mencius. Our conclusion: Mencius creates a mystical subject that grow from moral ablity of human-being and never exist in the discourse of jing-qi-lun.