About age and sla relationship, many theorists and said scientists should expressions made extensive research, but there are still a lot of controversy. Especially on the critical period age and sla relationship research situation of l2 years), the human brain has plasticity, let yi. Comparative linguistics acquisition, But Stern (1985) early in foreign language teaching age do produced summary. He thinks that don't exist in sla the critical period, each age paragraph the learner has its own optimal potential and insufficient. Age is small son virgin easier intuitively in communicative situations of language acquisition do out response and a younger age big children and adults with cognitive and easier to the classroom learning of the learning method. That is any age can be to learn a second language.