| The phenomenon of the displaced people is a key to unlocking the society in northern Wanbei. Since the Ming and Qing Dynasties, Wubei has become a heart-rending land from the perspective of disaster, this change has both natural and artificial factors. From the perspective of natural factors, human over-exploitation and destruction of the natural environment, as well as the Yellow River's acquisition of the sea, have caused the baptism of the disasters in the past hundreds of years, From the perspective of social factors, the feudal central government intentionally sacrificed this "local interest" in the name of "taking care of the overall situation. " It can be said that the emergence of the emigrants in the Ming and Qing Dynasties, conflicts between people and land, land annexation, social environment, and agricultural management methods. |