According to Fodor and Lepore,meaning is compositional,but the inferential role is not,therefore,meaning cannot be the inferential role.Brandom tries to explain the compositional feature of inferential role by sub-stitution inferences,and Peregrin tries to avoid the compositionality problem of inferentialism by distinguishing two different kinds of compositionality.Our arguments show that Brandom's and Peregrin's attempts are not success-ful.It would be better for inferentialism to abandon the idea that meaning is compositional.Moreover,there are many reasons to support this strategy.