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transformational genitive grammar. It also means that the elements in an idiom can be dismembered as long as the relative condition is satisfied. So the English idiom still exists some grammatical change such as plural form of the nouns; -ed and –ing form of the verbs; the third person singular form –s of the verbs; genitive form of the nouns; comparative and superlative forms of the adjectives 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 learner cognize, master and employ the idioms properly. A. Reasons of Change: Because language is a living thing, living things grow and change, so does language. Present-day English is also growing and changing. Many hundreds of English idioms have core down to us. Today English gives rise to a great number of idiomatic expressions. These are expressions being to the category of idioms. They can appear in a colloquial style, or in a formal style or even in slang. Because of so, people often need addition and adjustment to some idioms for the purposes of rhetoric so as to reflect emotional co lour and give prominence to gist. In addition, the contextual needs and the communicative needs, also cause the change of English idiom structure. B. Importance of Study: English idioms form an essential part in the general vocabulary in English. The general tendencies of present-day English are towards more idiomatic usages. Many hundreds of idioms are now accepted not only in spoken English but also in written English. Idioms reflect the environment, life, history and culture of the native speakers and are closely associated with their inner spirit and feeling. So it is a worthwhile research. At the same time, study on instability of English idioms can help learners to cognize, master and employ English idioms easily and properly. I. Grammatical Change Grammatical change refers to adding inflectional affixes to the end of word to indicate grammatical relationships. Modern English is an analytic language. Most endings are lost, leaving us only a few inflectional affixes. There is the regular plural suffix –s (-es) which is added to nouns such as machines, fridges, desks, radios, potatoes. The same forms –s (-es) can be added to verbs to indicate the simple present for the third person singular, e.g. like-likes, work- works, go-goes. The form –’s is another one used to indicate the possessive case of nouns such as the children’s library, the man’s role, a waitress’s voice, the mother-in-law’s complaints. We have also the suffixes –er, -est which are usually attached to simple adjectives or adverbs to show their comparative or superlative, e.g. happy-happier-happiest, hard -harder-hardest. Apart form these, these is the past tense marker –ed as mentioned above, and the –ing form added to verbs to form present participles or gerunds. The number of inflectional affixes is small and stable, which makes English one of the easiest languages to learn (Zhang, 1997) A. Tenses and Aspects The change of the verb affix refers to the tense and aspects mainly include the third single person, the past tense, past participle, present participle, gerund etc. To more exactly, here we take ‘make one’s friends a laughing stock’