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bsp;language  codes  that  should  be understandable,  interesting  and  related  with  each  other.  At  the  same  time,  comprehensible input  should  be  enough  for  foreign  language  learners  to  perform  best.  He  also  believes  that only  several  times?  language  input  is  not  enough  to  build  a  new  language  system  inside  the learners.    Krashen?s  Input  Hypothesis  is  influenced  by  the  Language  Acquisition  Equipment Theory  which  could  be  used  to  interpret  the  process  of  acquiring  a  second  language.  That process  is  from  input,  intake  to  output.  Certainly,  the  Language  Acquisition  Equipment Theory  also  has  greatly  influenced  foreign  language  teaching  studies  at  home  and  abroad. Krashen believes that key points of language acquisition should be put on inputting numerous target  language  which  is  worthy  learning.  However,  Krashen?s  Input  Hypothesis  has  some limitations. He completely admits crucial effect of language input on language acquisition but denies  the  important  effect  of  language  output.  He  considers  that  language  behaviors  like reading  and  listening  could  help  learners  generate  language  but  speaking  and  writing  could not. 
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2.2 Output Hypothesis 
Swains  Output  Hypothesis  holds  that  foreign  language  learners  need  language  input before  outputting  language,  but  language  input  does  not  necessarily  lead  to  language  output (1995). Comprehensible input and output are both equally necessary for learners to master a second foreign language. Swain?s Output Hypothesis opposes Krashen?s view which thinks that language input is more  important  than  language  output.  Swain  doubts  whether  learners  can  acquire  their second  language  efficiently  only  by  inputting  language.  Instead  he  believes  that  only  by having enough chances to output language can language input help learners accumulate their language  knowledge.  Certainly,  here,  the  language  output  Swain  mentions  above  is  target language output instead of mother tongue. Swain?s Output Hypothesis contains three main functions in the field of second language acquisition (1995). And these functions can greatly improve language accuracy. 
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3. Research Design ........... 13 
3.1 Research Questions .... 13 
3.2 Research Subjects ....... 13 
3.3 Research Instruments .......... 13 
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