Normal>///In Gansu-Qinghai region, compared with the previous Majiayao culture, the distribution of Qijia culture’s northern boundary trended south and the overall elevation lowered, which is the response to 4 ka B.P.extreme events of arid climate and temperature drop. Distribution of Qijia culture sites are sparser than Majiayao, the shortest distance between sites become larger and the dependence on the river reduced, which shows that animal husbandry came into being during the period of Qijia culture. Density analysis showed that Majiayao single-core condensed settlement model evolved into Qijia’s multi-core model around 4 ka B.P., and it implies that Qijia community splited into several tribal groups.