There are various factors influencing second language learning(L2 learning). Among then,affective variables directly or indirectly have an effect on the success of L2 learning. Based on the applied linguistics theories,the paper mainly discusses three major groups of affective variables—attitude,motivation,personality and how they influence L2 learning.It aims to make both language teachers and learners understand the importance of these variables so as to improve the efficiency of L2 learning and teaching. Based on the various factors influencing second language learning(L2 learning). ,motivation,personality and how they influence L2 learning.It aims to make both language teachers and learners understand the importance of these variables so as to improve the efficiency of L2 learning and teaching.