Abstract: Based on the theories of multi objective decision and AHP analyses,this article establishes a new kind of scale matrix and dynamic decision model according to the multi-objective and comprehensive environmental system and the characteristic of the assessment indicator metrics changing with time or temporal period.This model proposes the methods of the dynamic quantification of monitoring indicators and AHP based on the dynamically changing characteristics of influential factors of contributory area scarped exploiting environment,and realizes that dynamic quantification of AHP judgment matrix could satisfy there quirement of congruousness to all the temporal points in the whole temporal period Meanwhile,this article takes hydropower development in in nujiang River Area as an example to assess the decision.The computational resultafter putting on the environmental influence indicates that the effect of the established dy namic AHP decision model is favorable.

Key words: dynamic AHP, hydropower development, evaluate