The essence of confucian"Study for Oneself"is to perfect oneself,make of one's ideal character and reach one's ideal state.Ideal has very active functions in correcting the style of study,promoting rational values,expanding humanism spirit,overcoming rational means and utilitarianist trend of thought,correcting the styles of studying and teaching,overcoming academic and teaching utilitarianist means,partial and bad social effect of mood,guiding people to pay attention to making of morals,the inside value in settling down and getting on with one's pursuit,promoting the moral quality of people's national vigor.