Some place was Dawenkou Culture more than 5000 years ago, but it was replaced by Longshan culture about 4400 years ago  What caused the change of these two cultures? Archaeologists found that about 4400 years ago, a serious cold event occurred, the environment changed from warm and humid to cold and dry, the vegetation decreased greatly, the algae and aquatic plants basically disappeared, the Dawenkou Culture moved south, and the Longshan culture moved here from north
Dawenkou Culture has a tradition of continuous migration to the south
 Based on this, they believe that the extreme climate change around 4400 years ago, It may be the main reason for this cultural change