随着世界范围内越来越多的儿童开始学习多门语言， 双语/多语言教育成为了教育学领域一个十分重要的研究课题。双语/多语言学习者泛指在多种语言环境中成长、生活的儿童，也指那些在学习和社会活动中使用的语言与家庭日常生活使用的语言不同的儿童。
例如：大多数美国中小学使用英语教学，然而很多在美国的南美人家庭使用西班牙语作为生活中交流的主要语言；在中国广东省很多区域，普通话是课堂教学的主要语言，然而很多家庭使用广东话作为日常交流语言。
随着全球国际化的趋势，跨地区、跨民族的语言接触日益颗繁,很多语言学习者和使用者需要学习多种语言。这些现象引起了国内外学者的关注和兴趣，多语习得在国内外成为新兴的研究领城。为了使国内研究者及时了解当前国内外多语习得研究状况，该文将对近二十年来国内外所做的研究进行综述，分析其概念内涵、研究历史和现状、研究范畴，研究展望与思考。
As more and more children around the world begin to learn more than one language, bilingual/multilingual education has become a very important research topic in the field of education. Bilingual/language learners refers to grow in a variety of language environment, life of children, and those in the language learning and social activities and family children everyday use of language is different.
For example, most American primary and secondary schools teaching in English, but many South American families in the United States in Spanish as the main language of communication in life; In many parts of China's Guangdong Province, Mandarin is the main language of instruction in classrooms, while Cantonese is used in daily communication in many families.
With the trend of global internationalization, cross-regional and cross-national language contacts are increasingly numerous, and many language learners and users need to learn multiple languages. These phenomena have attracted the attention and interest of scholars at home and abroad, and multilingual acquisition has become a new research field at home and abroad. In order to make domestic researchers timely understand the current research status of multilingual acquisition at home and abroad, this paper will review the research done in the past two decades, analyze its conceptual connotation, research history and current situation, research scope, research prospects and thinking.