The political systems of yan state -- its bureaucracy and enfeoffment institution during the warring states period .
燕国的政治制度--战国时期的官僚机构和封君制度。
Enfeoffment , court meeting , sacrifice-offering and execution made patriarchal ideas and oath-making conventions mutually influence , which changed considerably the social structure and national distinctions in those days .
Secondly , with the development of the economy , the feudal system of enfeoffment together with the concept of christendom that prevailed in the medieval europe had been disintegrating .