With the acceleration of globalization and the increasingly complex international situation, language is not only a written symbol, but also a social and cultural function to mark countries and nations. Great changes have taken place in people's view of language. Some linguists are no longer confined to the study of micro-linguistic phenomena such as pronunciation, vocabulary and grammar, but focus more on macro-linguistic phenomena closely related to national interests and national security. Especially with the development of modern informationization in recent years, language policy has also become an important topic of concern to linguists. This paper discusses the research of American minority language policy based on knowledge base from the research background, research purposes, research ideas, research methods, innovations, and theoretical and practical significance.