Sages must be knights，knights must be sages，sages and chivalrous integration，is the highest state of life in northern learning. The four stages from rash realm，knight-errant realm，righteous man realm to sage realm are from chaotic instinct state，to pursuit of self-interest，to pursuit of justice，and finally from chivalrous to sage. Through the four stages of promotion with Yan-Zhao cultural characteristics，the life realm of Northern Learning has been sublimated. Xiongan context plays an important role.