Abstract: This article is the first section of a series of articles on Foreign Language Learning Information Processing in Bilingual Dual-double Structure Theory.On the basis of a brief overview and discussions on the concept of Modern Cognitive Theory of Language Acquisition, the author presents a distinct description on the kernel content of The Foreign Language Learning Bilingual Dual-double Structures, and then carries out a deep analysis and discussion on Second Language/Second Language Acquisition, Bilingual/Bilingual Acquisition, Foreign Language/Foreign Language Learning and some other related issues as well.The author explicitly points out that the function and impact of the humanistic-social factors and inherent cultural properties of the mother language imposed on the foreign language learning process is the crucial matter of the foreign language learning strategies, which is quite different from that of the first language acquisition, which should be of great concern and attention to the field in foreign language learning.