Based on the principle of ecological footprint,ecological tension index and ecological occupancy index for the evaluation of ecological security are presented,and the standards of ranking are constituted.Ecological footprint and its capacity from 1985 to 2003 in Qinghai Province are calculated.Ecological tension index and rank partition standards are used to measure the ecological security of Qinghai Province.The result shows that the ecological security of Qinghai Province in recent 11 years has been the second grade.