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An effect to the grasslands ecological health and one impact of livestock production were the density of rodents increase abnormally. Plateau pika (Ochotona curzoniae) and Plateau zokor (Myospalax baileyi) in Qinghai-Tibet Plateau accelerate degenerate in the grasslands of up to 29.84[％] of the areas generally,even up to more than 40[％] of areas locally.It can cause economic damage as much as 3.2 billion yuan.