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Abstract English also has many idioms as other languages. Usually, Structural stability and semantic unity are considered as the two characters of English idioms. And the elements of English idioms can not change a little even an article. That is to say we can’t change the elements and the word order of English idioms, and can’t delete any component of it and cannot add any words to an English idiom. However, in the specific context, the structure of idiom is not always stable. In this paper the author thinks that there still exists some grammatical change such as plural form of nouns;-ed and –ing form of verbs; the third person form of verbs; genitive form of nouns; comparative and superlative forms of adjective and adverbs. As to lexical change, we can add some elements to some idioms, delete some elements of the idioms, and we can change the order of the elements of the idiom and we can dismember the elements of the idioms. Meanwhile, the meaning of idioms can also change because the grammatical and lexical change. This research can help the learners’ cognize, master and employ the idioms properly. 摘要同其它发达语言一样，英语也拥有大量习语。习惯认为英语习语具有结构的稳定性和语义的整体性两大特征, 也就是说习语的结构是固定不变的, 其具体表现在构成成分间的不可替代、顺序不能颠倒或改变、不能删除或添加等词法上的稳定性以及语法上的不可分析性。但在具体语境中，英语习语的结构并非不可变化，具体表现在名词的复数形式, 动词的三人称单数形式, 动词的现在分词与动名词形式, 名词的所有格形式，形容词与副词的比较级和最高级形式等方面的语法变化以及构成成分的替代、添加、删除、位移、缩短和分散等方面的词法变化。由于习语在词法和语法上的变化, 就会或多或少地导致习语在语义上的变化。因而作者认为英语习语又具有非稳定性的一面。通过对习语结构变化的具体分析，有利于学习者更加准确的认知英语习语、掌握英语习语和应用英语习语。 Introduction Like many other languages, English language also has a large number of idioms. English idioms are composed of fixed phrases and short sentences. English idioms can be defined as an expression established in the usage of a language that is peculiar to itself either in grammatical construction or in having a meaning that cannot be derived as a whole from the conjoined meaning of its elements (WNWD:1123).Usually, Structural stability and semantic unity are considered as the two characters of English idioms. That is to say, the structure of English idioms can not change their any elements even an article. In general condition, we can’t change the word and the word order of English idioms. These means we can’t delete any element of English idioms and we cannot add any word to it. Meanwhile we can’t analyze the grammatical feature of it. However, in the special context, the author thinks that the structure of idiom is not always stable. According to Saussure, of the relationship elements in any structure are either Syntagmatic or Paradigmatic. Idiom is a kind of structure which has special meaning, and its element also has a kind of special Syntagmatic and Paradigmatic relationship (Hu, 2001). According to syntagmatic and paradigmatic the addition and deletion of the individual in an aggregation can only cause the addition and deletion of the quantity of it and cannot affect the quality. Meanwhile each individual can be replaced one another. According to this we can change the elements of idiom in a small amount (Xu, 1983). Xu(1983)also pointed out in an aggregation the individual’s meaning is not preserved, so in a specific sentence we can add or delete some words and the meaning will not change. This means that in an idiom we can add or delete some elements and the meaning keeps unchangeable. Chomsky said that in a structure any element can move its place or move in some manner if the certain condition is satisfied (Hu, 2001). This is his famous Move α rule in his