Based on the analysis of land resources and current population status and the characteristics in the Qinghai Lake region

the ultimate and maximal population carrying capacity of land and the pop ulation carrying capacity of cultivated land and grassland and its proportion in each county are estimated. Results show that the ultimate population carrying capacity of land in the region is 695973

in which cultivated land is 483720

grassland is 212703

and the corresponding capacity ratios are 69.44 % and 30.56 %

respectively. The total maximal population carrying capacity of land is 324620

in which cultivated land is 181219

grassland is 143410

and the capacity ratios are 55.82 % and 44.18 %

respectively. The maximal population carrying capacity is diffident in each county. Population carrying capacities of Gonghe County

Haiyan County

Gangcha County

and Tianjun County are 7.01756

6. 00874

5.96404

and 0.03318

respectively. The capacity of cultivated land and grassland in each county is also different.