【正文】 formed, and prehensive abilities are reinforced. These are considered beneficial factors in language acquisition. But they also lack selfdiscipline, and heavy study burdens make them hard to concentrate on subject learning. During the adult period, they tend to possess a strong study incentives and a clear study destination. Apprehensive abilities reach its highest peak. The pitfalls are too busy in work or study, short of enough time, and also, with an unfavorable biological basis.Age on second language acquisition exist, second language learners of different age in second language acquisition has different advantages. Children and adolescents are good at imitation, possess good shortterm memory, learn more flexibly, dare to express themselves and are good at effectively acquiring language in a language environment. Therefore, they have an advantage to obtain accurate, nativelike pronunciation and intonation.. The Research Results of Age FactorThe majority of second language learners fail to reach nativespeaker levels of ability. It is also important to ask whether age effects are evident in such learners. Do learners who begin learning as children in general reach higher levels of second language ability than those who start as adolescents or adults? This question has been addressed in research that has pared the level of proficiency reached by second language learners who began as children with that of learners who began as adults. We do not know, of course, if these studies show the effects of age on these learners’ ultimate level of attainment, as the assumption that they have reached their ‘final state’ may not be justified. Studies of learners in naturalistic learning situations provide the most convincing evidence that younger is better and, therefore, some support for the critical period hypothesis. We will examine some of the most frequently cited studies. Concerning the relationship between second language acquisitions and the age, the current researches found that adults possess the initial rate advantages over children in the acquisition, especially in the syntactic context. However, if the children receive adequate exposure, eventually they will catch up. Children are more likely to achieve nativelike grammatical petence。 their concern is the language of the law system itself. The second language acquisition take the learner39。Second language acquisition research has been 40 years of history. Especially since the 70s of the 20th century, various research theories constantly updated, the scientific methods are also moving forward, and second language acquisition is a plex human phenomenon. As an emerging interdisciplinary field in the development of second language acquisition, research should pay attention to the nature of the scientific orientation of their discipline and disciplinary system of scientific construction. Second Language” contains the third, fourth or more other languages naturally (Ellis, 1994).. Second Language Acquisition Related Concepts. Native LanguageNative language usually refers to the acquisition of language young learners. As their mother tongue or ethnic family, munity language, and therefore known as native. In general, the mother tongue is usually the first contact, and is acquired after children were born. Therefore, the language is often referred to as the first language.First language usually refers to the learner39。 Keywords: Individual Factors。此外，文章中初步建立了個(gè)體因素研究的框架。An Introduction To Individual Factors In Second Language Acquisition AcknowledgementIn writing this paper, I have benefited from the support of my teacher and my classmates. First of all, I would like to extend my sincere gratitude to my supervisor, Zuo Yi, for her instructive advice and useful suggestions on my thesis. I am deeply grateful of her help in the pletion of this thesis. High tribute shall be paid to Ms. Zuo yi, whose profound knowledge of English triggers my love for this beautiful language and whose earnest attitude tells me how to learn English. I am also deeply indebted to all the other tutors and teachers in Translation Studies for their direct and indirect help to me. Special thanks should go to my friends who have put considerable time and effort into their ments on the draft. Finally, I am indebted to my parents for their continuous support and encouragement.摘 要文章中介紹了第二語言習(xí)得的主要內(nèi)容和個(gè)體因素的研究方法。它總結(jié)了關(guān)于在研究個(gè)體因素成果的基礎(chǔ)上提出的問題或研究趨勢。關(guān)鍵詞：個(gè)體因素；第二語言習(xí)得；研究方法；AbstractThe article briefs the main content and research methods of individual factors in second language acquisition, focuses particularly on the frequently mentioned individual factors, and discusses main individual factors in second language acquisition, and their correlations with the language learning, namely age, motivation, language aptitude, attitude and personality. It puts forward the problems or the trends of the research on individual factors on the basis of summarizing the achievements of the researches. Besides, the framework of examining individual factors is tentatively established in the article. Because individual factors play a crucial role in the success of second language acquisition, they bee an indispensable part of second language acquisition model despite of the differences of research methods as well as discrepancy of the research results obtained in the field. The author hopes to publicize the latest researches in this field and raises further studies of the others.Table of ContentsAcknowledgement i摘 要 iiAbstract iii1. Introduction 12. Second Language Acquisition Research 2. Second Language Acquisition Related Concepts 3. Native Language 3. Second Language 4. Second Language Acquisition Subject Nature 4. The Object of Study 4. Second Language AcquisitionThe Relationship between the Relevant Disciplines 4