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, the input hypothesis and the affective filter hypothesis, in which the  comprehensible  input  theory  is  the  essence.  As  for  Krashen,  comprehensible input  theory  should  refer  to the  following  two  implications.  First,  “comprehensible input” is the only condition of second language acquisition. That is to say, human beings cannot learn  language until they receive comprehensible  input or understand messages.  Second,  according  to  the  natural  order hypothesis,  people?s  development of  language  competence  obeys  certain  objective  laws.  In  the  process  of  language acquisition,  if  our  current  language  level  is  “i”,  with  the  help  of  language  contexts   we  can understand  the  language  input  higher  than  the  level  “i”. 
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2.2 Review of researches on CSs 
Since  American  psychologist  Brunerhad  put  forward  the  term  “Cognitive strategy”  firstly  in  1956,  Newell,  Shaw  and  Simon  imitated  effectively  the  process of  problem-solving  through  computers  in  1958  (Shi,  2001).  Based  on the  theory  of “Cognitive Strategy” and their study, they raised a new concept “Learning Strategy”. This concept arouses great attentions from educational psychologists, which leads to their  study  about  language  learning  strategy  in  SLA.  Later,  they  divided  learning strategy into two categories, macro-strategies and micro-strategies. Macro-strategies have  broader  extension  focusing  more  on  affective  and  motivational  factors.  They have  close  relations  with  learners?  culture  background  and  personality  differences, not  easily  changed  by  the  educational  influences.  Micro-strategies  stress  more  on special knowledge and skills, which is closely related to cognitive process and easily influenced  by  education.  Therefore,  micro-strategies  are  research emphasis  for educational  psychologists  and  linguists.  From microcosmic perspective,  learning strategies  can  be  classified  into  various  types,  for  example,  listening  strategy, reading strategy, vocabulary strategy and oral strategy according to specific needs of learners in SLA. Oral strategy here means communication strategy. Communication strategy  relates  closely  with  language  input  as  well  as  language  output.  After learners?  processing  of  input,  communication  strategy  is  employed  in  utterances (output)  by  them  to  overcome  communication  problems  and  to  reach  mutual understanding goals. 
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