Abstract: Although it is an etfctive method for combination evaluation to solve the inconsistency from dif ferent evaluation conlcusions,different results will still be caused汕en adopting different combination evaluation methods,and this is a new inconsistency.On the basis of introducing the definition of validity and four assumptions,the paper shows an idea comparing different combination evaluation methods.validity through an example,and provides a way to solve the new inconsistency mentioned above.

Key words: comprehensive evaluation: validity, inconsistency, combination evaluation