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independent branch, we can say the study of interlanguage variation is successful.Basing on the above problems, the research objective of the present paper is toconclude and analyze the multi-factor’s influence on the interlanguage variationin view of the existed study. All of the possible causes of interlanguage variationwill be considered. Thus considering the complexity and variability of thelearners’ language, the author will adopt the multi-factor method to analyze thevariable performances of interlanguage in this paper.
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Part 2 Theoretical Framework and Related Literature

2.1 Theoretical Framework
This paper aims to study interlanguage variation, making use of theintra-language factors and the extra-language factors in a conjunct way, namelythe multi-factor approach. The author chooses it as the framework for this studybecause such multi-factor approach is both theory-found and valuable.More and more scholars are interested in the phenomenon of the learners’interlanguage variation. The viewpoint about interlanguage variation is becomingmore and more diverse. Different experts and scholars explore and analyzeinterlanguage variation from different angles based on various theoretical views.Ellis (1994:119-120) held that there were totally three kinds of approaches usedto illustrate the clear difference between variability and systematicity of thesecond language.The first approach is that practiced by linguists in the Chomskyan tradition, whoadopt what Tarone (1983) has called “the homogeneous competence model”.From this approach, variation is not regard as the potential knowledge system ofthe learners but as a characteristic of language performance. That is to say, it isnecessary to regard the learners’ performance rather than the underlyingknowledge system of learners as a standard of variation in order to investigatelanguage. Therefore, the problem of variation is to distinguish between “ability”and “performance”. What’s more, it needs to establish the description andexplanation of linguistic competence.

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2.2 Related Literature
In this chapter, the author will first introduce the definition and the categorizationof interlanguage variation that are pertinent to the purpose of the presentresearch. American linguist Salinger put forward the concept “inter-language” for the firsttime in 1969, and then in 1972 he proposed the interlanguage hypothesis in hisfamous essay “inter-language”: he pointed out that the hypothesis ofinterlanguage aims to explore the language system and the acquisition ofhypothesis when acquiring the second language. Salinger’s hypothesis ofinterlanguage has a great significance in the research history of second languageacquisition.According to Tarone (1988), when the second language learners try to conveytheir meaning, the language produced will be changed in their grammar andpronunciation accuracy with the changes in the specific environment. (Tarone,1988:73) this kind of variation about production accuracy can occur in a period,sometimes in minutes and these special variations can be predicted in thesituations and tasks.
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Part 3 Method........ 26
3.1 Introduction ........ 26
3.2 Materials....... 26
3.3 Design .... 26
3.3.1 Subjects ....... 27
3.3.2 Instruments........ 27
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