Species property of human language entails two biologically relevant issues, i.e. language evo-lution and language change. The paper argues that language change, generically displayed on expression struc-tures such as phonology and morphology, is an incremental process triggered by multi -factors. It is insuffi-cient to claim that Chinese is the direction of all language changes based on convergence of reforming language writing system, economy principle of expression, and morphology change, which is inconsistent with language data, and contradictory to current researches as well. Human langua...
