Abstract: Based on analysis of the technical route of the weighted normalized indices in“Technical Criteria for Evaluation of Eco-Environment”(HJ/T 192-2006),a conclusion was reached logically contradicting the specifications of HJ/T192-2006,regarding land degradation, land degradation index and ecological environment index(EI).On such a basis,two computation methods,i.e.“adjusted erodibility enpowering order method”and “minusing land degradation grading index method”were brought forth and verified.Analog computation using the methods demonstrates that of two plots similar in the proportion of moderate or severe erosion,the one higher in the proportion of light erosion is higher in EI of the two plots similar in the proportion of light erosion the one with higher proportion of moderate eronsion is higher in EI.It was found that the outcomes of the computation using the two methods tallied with the common logic of evaluation of eco-environment and were highly synchronus in statistical check,demonstrating that both methods are applicable to practical evaluation of eco-environment.

Key words: ecological environment, evaluation, land degradation index