After lived peacefully for a long time, the Chaldean civilization disappeared gradually. With some innovative and magical methods coming up, people became proud of their living ways. However, the rule policy of Ashur could not catch up the step of trade development. As time flies, the different area started self-governed and just handed a certain symbolic tax to emperor far away from them. Even so, peace still existed thus it didn’t matter much. Things went worse when two natural disasters stroked one by one which indicated the end of the two millennia of Chaldean civilization. The disaster may be the worst flood in the history. Majority of cities and a large number of crops washed away. Many villagers lost their lives in the huge disaster. Moreover followed by a sudden strike of Alfar which owned a massive army power, the heartland of the empire was lost at last. The Alfar successfully finished the revenge to the Ashur. Till now, more than 400 years’ rule by Ashur-ubaid was ended.