Studies on first language acquisition provide a closer examination into how mind works and how cognition develops. Among the studies, those who focus on meaning sense acquisition reveal that children acquire meaning of their mother tongue and the concepts of the world simultaneously. Forming concepts is the beginning of cognitive development and has been thoroughly?studied in the field of cognitive science. By clarifying the relationship between the development of children’s concepts system and that of first language meaning sense, this paper attempts to study how children acquire the meaning of language, how they categorize the world through language learning and some semantic features in children’s language from cognitive approach