This document summarizes the results of an agent-based model that simulates the migration and population distribution patterns in China over time. The model shows that the north-south population distribution inverted around 918 AD due largely to the Anshi migration waves, while the uneven east-west distribution with 94% of people in the east emerged around 1246 AD and was most influenced by climate changes from 1230-1260 AD that affected agricultural potential. Agent-based simulations can help analyze how historical population dynamics and regional distributions evolved over time in response to various social, climate and agricultural factors.
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