Some scholars think the king's eldest son who was born by his Queen inherited the king's throne. This system is as same as
that in Zhou Dynasty. The phenomenon that his younger brother inherited the king's throne was just occasional. In my opinions, the point of view should be discussed. The author thinks this is the pattern of the king's throne system in Xia Dynasty: after one king died, his brother could get the throne. But being the former king's brother, the successor had no right to give king's throne to his son,while the throne should be returned to his eldest brother's eldest son after the new king died. The king's list was often recorded orally and the royal historians valued the Queen's eldest son. The author thinks there are two reasons for the special king's throne system: firstly, the underdeveloped productive force resulted in the extensive
plough pattern in agriculture. Secondly, the basic social units were still clans or tribes. The king's throne system in Xia Dynasty was the produce of China's ancient productive force and
the social basic unit at certain period. This is universal in some degrees in history.