本文以Pienemann所提出的语言可加工性理论(Processibilityttheory)为基础,从认知的视角解释中介语的发展的规律和特点,这对于传统的迁移理论来说是一种全新的挑战,旨在证明母语迁移受学习者语言加工能力的制约,学习者只有具备了可加工的前提才能成功获取二语知识实现母语的迁移。 Based on Pinesemann’s theory of processibility ’tability, this paper explains the rules and characteristics of the development of interlanguage from a cognitive perspective, which is a completely new challenge for the traditional theory of migration. After proving that the transfer of mother tongue is restricted by the learner’s language processing ability, the learner can acquire the second language knowledge and achieve the mother tongue migration only by having the processable premise.