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该域名的形态是从希腊字，变形。形态是语言学，尤其是词汇，研究的内部结构和规则的话，如那些具有多于一个有意义的元素，和形态也是语法分支的分支之一，但它的重点上的结构/形式和种类的话。形态的本质是构词。　
The domain of morphology is from the Greek word, morph. Morphology is one of the branches of linguistics, especially the lexicology, which studies the internal structure and the rules of words, such as those having more than one meaningful element, and morphology is also the branches of grammar, but it focuses on the structure/ forms and kinds of the words. The essence of morphology is word-formation.https://www.51lunwen.org/zuzhixingweixue/
从20世纪70年代，西方已经开始注重形态学上的各种问题，因为印欧语作出了巨大贡献的语法和词汇。因此，两个域的划分：屈折形态和派生形态，显然是后者重点词汇。派生形态学集中在词汇的构词的过程。
　　　From the 1970s, Western morphologists have begun to lay stress on the inflection and derivatives of words because the Indo-European contributed greatly to the on grammar and vocabulary. Thus, two domains are divided: inflectional morphology and derivational morphology, and obviously the latter focus on lexicons. Derivational morphology is focussed on the process of word-formation in lexicology.
　　　Linguists have considered consider morpheme, or word as the basic unit of morphology since the structural linguistics of Saussure. Morphological structure can be interpreted as the concatenation of morphemes. Morphemes and morphs are the results of research of the same language basic unit starts from lexical morphology and derivational morphology respectively.
However, the generativists believe that, if grammatical morphemes are located in the lexicon like words, then the rules will bind them as compound words. Generativists analyze words in the domain of morphology, while sentences in syntax. Generational morphology designs a morpheme based model: build a corpus, a series of morphemes operated under a set of word-formation rules, and the word-formation rules are morphological rules. Thus, morphology is actually the binding of syntax on one end and semantics on the other end. Among these, corpus is undoubtedly the frame of language study, deduction and elaboration.
Just as society develops, the developing of the society, words are change in form, pronunciation and so on. In the process, some words were never seen appear while some disappear. Based on this phenomenon, a conception of productivity emerged. Productivity is one of the key concepts of derivational morphology. It refers to the ability to construct new words of affixes or word-building rules. Productivity is "used in linguistic to refer to the creative capacity of language users to produce and indefinitely large number of sentences."(Crystal, 1991, p.279). Hockett (1985, p.575) gives the label productivity to that property of language which allows us to say things which never was said before.
Productivity has been neglected for centuries. For the domestic research, because of the difficulty of making a comprehensive analysis, it is especially few. Overseas researchers have begun to pay attention to the topic productivity. Actually, productivity is quite important for the Chinese English learners and productivity has become important for the linguists. In this paper, I will study the productivity from the point of probabilistic model and the importance of productivity will be concerned again.
1.2 Objectives of the study
Productivity is one of the center conceptions of derivational morphology which refers to the ability of affix (suffix) or word-formation rules to produce new wor