AbstractAmerican English and British English are two branches of English language. As the carrier of their own cultures, the distinction of these two languages origin among their different histories, politics, economy, geography, social life and civilisation, and present in the linguistic levels such as pronuciation, vocabulary and grammar. Generally speaking, American English is more concise than British English. The simplification in American English from British English is very obvious in the spelling of the words. Meanwhile, the expession of American English is more unconstrained than British English, which is more clear in oral speaking. British English also have its own evolution and change, not so distinct but different from American English. Two variants of English have a great influence on daily life and society. Under the effect of the advance and wildly spread of American politcs, economy and culture, American English also has a great impact on other English branches encluding British English, and the United Kingdom have started from a traditional English exporter to an importer. Because of the closer relatinship between the two English language, the characteristics of British English and American English are converging. English as one kind of world language, is the tool for information exchange and feedback, and increasingly demonstrated its important position in international exchanges. Knowing the difference between American English and British English would help us to deepen our understanding about English language and treat the different English user correctly. Key words: British English, American English, differiences 摘 要英式英语和美式英语是英语的两个分支。作为它们各自的文化载体，由于其拥有各自的发展历史，不同的政治、经济和地理环境，以及不同的文化和社会生活，造成这两种语言在一些语言学层面，诸如发音，词汇和语法上存在一定的差异。一般而言，美式英语比英式英语更简洁明了。美式英语对英语的简化在词汇拼写上尤为突出。同时，美式英语在表达上也更加灵活，尤其在口语中更是如此。英式英语本身也经历了进化和演变，不像美式英语那么明显，同时也和美语有所区别。英式英语和美式英语，这两种英语变体都对当今日常生活和社会造成影响。由于现在美国在政治、经济、文化等诸多方面的优势和对世界的广泛影响，美式英语对包括英式英语在内的其他英语分支都所影响，而英国则开始从原来传统意义上的语言文化输出国逐渐变成输入国。随着这两种英语的关系越来越密切，它们之间的界限也越来越模糊。英语作为一种世界语言，已经成为了信息交换的和反馈的重要工具，在国际交流中的地位逐渐凸显。了解英式英语和美式英语的差异可以帮助我们加深对英语的认识，也可以使我们更恰当的同不同英语使用者进行交流。关键字：英式英语、美式英语、差异Contentsabstract. 1摘 要.2I.Introduction.4II.Histories of British English and American English.52.1 History of British English.52.2 History of American English.6III. Difference between British English and American English.63.1 The source and characteristic of the difference between British English and American English.63.2 Aspect of grammar.83.3 Aspect of vocabulary.93.3.1 The meaning of words.93.3.2 The spelling.103.4 Aspect of pronunciation.11IV. The trend of the development of British English and American English.12V. Conclusion.13Acknowlegements.14Bibliography.15Brief Analysis of the differences Between British English and American EnglishI.IntroductionFor most of the College students just like us who began to accept English language education from last century, English is just one single language, just as our own Mandarin Chinese. Even now, as we have already known that what we learned from our middle school is actually British English, and In modern times, English language has became the most papular language. It has been used in 172 countries and areas. It is used in Some countries, such as Great Britan, United States, Canada, and Australia, as their mother language. For many other counties and areas,just like India, HongKang, the Pilippines, South Africa, etc. English is considered to be the offical language. Like Chinese, English language also varies from area to area and has many defferent dialects and branches. Each branch of English has some specific features and is different from others. only few of us can tell the differences between