Feudalism is a system of power. He in the mansion holds power, those near to him fight to maintain his power, next down those with land make it productive so that all can eat and the lowest level work to maintain themselves as well as all those above. they give the produce gained by their labour to the lords in exchange for protection.
It was a economic and political way of governing. In the Zhou period every region was given to a specific individual who became the established leader of that region. There was also shared power system between regional leaders. This was termed Fengjian, a philosophy as much as a way, a means of governing.
Yes, feudalism existed in Zhou China. The king starts out with all the land and begins to sell off large portions of his land to the lords in exchange for soldiers to fight for the king in time of war. Western writers often describe the Zhou period as “feudal” because the Zhou system invites comparison with medieval rule in Europe.
When the dynasty was established, the conquered land was divided into fiefs that eventually became powerful on their own. According to commentary, the “son of heaven” divided the lands among his feudal lords; the feudal lords divided the lands among the dependent families.