Abstract: The genetic evolutionary account of language internalizes cognition in human brain,ignoring the coordinated interaction between the interior and exterior of the brain during language evolution.The latest empirical research of cognitive science dispels the core hypothesis of genetic evolutionary account and supports the cultural evolutionary account of language.The new account of language evolution reveals the internal mechanism of the cultural evolutionary process of language from the interaction of three dimensions:external selection pressure and internal evolutionary adaptation,neural development and cultural development,self-domestication and language evolution,opening up a new methodological path for the neurobiological study of language evolution.

Key words: genetic evolution, cultural evolution, self-domestication, cognition extension