NGON NGTI so9 2022 HII6NG DEN Mer uO siNs roAN orpN rug oAc NcON Nc0'o TRE EM PHA}I HIIiNI Abstrrct: The article briefly presents some theoretical approaches on language acquisition in children; analyze, evaluates, and discusses the approaches in order to point out the advantages and limitalions ofthe theories In the later part ofthe article, with the hope ofleading to a comprehensive model of language acquisition in children, we propose to present Bronfenbrenner's ecological theory to explain the process of language acquisition in children; discuss the different aspect of each subsystem in the picture oflanguage acquisition under the bioecological system theory We believe that ecological theory is the most multifaceted framework to reflect the diversity and complexity of language acquisition in children Up to now, this theoretical approach has not been studied and much applied in Vietnam Kcy words: bioecologicol ststem theor),, child language acquisition, BronJbnbrenner, development, lileracv l Dit vAn dd Cho tliin tli c6 nhiiiu li thuyiit va su phet tri6n tim li n6i chung vd su phrirt ri6n ngdn ngt d trd em n6i ri€ng Tuy nhi6n, hAu h6t cric li thuydt d6 chi tap trung vdo mQt binh diQn cua thgc tE da d4ng Ii tim li va ng6n ngt loii nguoi Tu gita th{p ki 50 cua thC ki XX, viQc nghi6n cuu quri trinh thu dnc vi hqc 6p ng6n ngf trd em dugc xem li mQt cuQc c6ch mang voi sq.ra