AbstractEnglishisanimportanttoolininternationalcommunication.Withthedevelopmentofsociety,thetwovariantsofEnglish,BritishEnglishandAmericanEnglishhavechangedsignificantly.TherearealotofdifferencesbetweenAmericanEnglishandBritishEnglish,andthereasonsfortheirdifferencesliemainlyinthreeaspects:histories,politicsandcultures.Thisthesisistryingtoanalyzethehistorical,politicalandculturalreasonsleadingtothedifferencesbetweenAmericanEnglishandBritishEnglish,andtryingtopresentsometypicalexamplesofdifferencesinvocabulary,spellingandgrammar.Atlast,itpointsoutthesignificanceoflearningthedifferencesbetweenAmericanEnglishandBritishEnglish.Keywords:AmericanEnglish;BritishEnglish;differences;reasons;significanceofstudy中文摘要英语在国际交流中发挥着极其重要的作用。随着社会的发展，英语的两个重要的变体：美式英语与英式英语，也产生了很大的变化。美式英语与英式英语之间存在着许多差异，造成这些差异的因素是多方面的，本文尝试从历史、政治以及文化三方面去分析美式英语与英式英语产生差异的原因，并且通过典型的例证，列举了英语在词汇、拼写和语法等方面的区别，阐述了其间存在的主要差异，最后论文指出了学习美式英语与英式英语之间的差异的重要性。关键词：美式英语；英式英语；差异；原因；学习意义1.IntroductionEnglishlanguage,whetheritisspokeninNorthAmerica,theBritishIsles,Australiaoranyotherplacealloverworld,isonelanguagewithitsdifferentvarieties“equal”siblings.AmericanEnglishistheformofEnglishusedintheUnitedStates.BritishEnglishistheformofEnglishusedintheUnitedKingdomandtherestoftheBritishIsles.ItincludesallEnglishdialectsusedwithintheBritishIsles.TheyarethemostimportanttwovariantsofEnglish.Theyhavedifferentcharacteristics.SinceAmericanEnglishandBritishEnglisharesortof“samelanguage”,thenwhytherewillbethedifferencesbetweenthem?WhenEnglishstudentsaregivenEnglishcourse,inmanycases,theyarejustlearning,payinglittleattentiontothedifferencesbetweenAmericanEnglishandBritishEnglish.Butasamatteroffact,AmericanEnglishandBritishEnglishdifferalotinmanyaspects.Thesedifferencesappearduetohistorical,political,social,cultural,racialreasons.FromthemomentwhennativeEnglishspeakerbroughttheEnglishintothenewcontinent,theEnglishlanguagehadalreadystartedchanging.OnstudyingthereasonforthedifferencebetweenAmericanEnglishandBritishEnglish,manysc