In the filed of Second Language Acquisition (SLA),language learners’final competence and learning efficiency could be greatly influenced by individual differences,including language aptitude,learners’motivation,first language context and age.These individual differences mentioned above are always regarded as the remarkable parameters in the study on SLA.As one of the most influential parameter,age newly has been re-fetched by contemporary SLA researchers and in this research field critical and sensitive period hypothesis are set as highly valuable research target to explore the problems of learning rate,teaching method ology and language policy.This article firstly introduces the basic theoretical framework of critical and sensitive period hypothesis,and then explores the relation of these two hypotheses and the SLA by existing experimental results.Based on detailed theoretical introduction and exploration of recent research experiment,implications of critical and sensitive period hypothesis are further ap plied in the Chinese teaching context,i.e.the feasibility of age-based multi-methodology teaching method.Meanwhile,exist ing limitations of current major research in this filed also will be presented in order to assist the future experimental study in Chi nese teaching context,especially university ESL teaching.
