Based on the implication of"traditional mileage"and the difference between the ancient and contemporary mileage,after calculation,it is concluded that Lianguan 90 or 98 li"Southeast Liantian",as said in Tang Dynasty,is actually located in Muhuguan,Northwest of Shangluo.

In 1951 the eastern Inner Mongolia autonomous government implemented the policy of "To protect the pastureland,to prohibit reclaiming wasteland",so did the western Suiyuan provincial government,thus the land not suiting cultivation was closed.

Evolution of the relation between farming and animal husbandry in the early period of the Northern Wei Dynasty;

The Formation and Characteristics of Guan Mucun s Vocal Style;