Memory plays a crucial role in language learning. This paper discusses some language learning techniques and strategies from three different perspectives such as sensory register, short-term memory, and long-term memory through the angle of optimizing the input by increasing its comprehensibility, accelerating language processing by activating schemata, making use of Chunking, with the aid of association, adopting the key words strategy, better organizing knowledge system and easily picking up information so as to enhance learning efficiency.