Abstract: Under the guidance of “pressure-state-response” model, a conceptive model of ecological safety assessment, and by the combination of entropyright and comprehensive appraisal methods, this paper made an assessment on the grassland ecological safety of Gansu pastoral area. The results of this assessment were in good correspondence to the regional actual situations, indicating that entropy-right method was applicable in this field. Using entropy-right method to determine the weights of assessment indices could resolve the problem of many indices not having unique standard, reduce the disturbance of subjectivity in the course of assessment, and reflect the contribution of each index to regional ecological safety more objectively. This method offered a new research means and idea to quantitatively assess regional ecological safety, and had certain practical value and popularization meaning in the related research fields.

Key words: Leymus chinensis population, Energy allocation, Growth and reproduction