For many years now," autonomy" in learning has been a topic of widespread discussion in educational field.Accordingly,it is Henry Holec who introduced learner autonomy to the field of second language in his project report to the Council of Europe in 1981.Motivation is also a widely used psychological term in our daily life and research.Both learner autonomy and motivation are important factors in influencing learning effects.Many researchers conduct studies on learner autonomy and motivation.There are also some studies on the correlation between learner autonomy and motivation in SLL(Second Language Learning).However,few of them focus on the effect of learner autonomy on motivation.Thus,it makes an attempt to investigate whether learner autonomy has an enhancement effect on motivation.It combines motivation and learner autonomy together to find some effective and efficient ways of promoting foreign or second language learning.In another way,it enriches learner autonomy research.It holds that learner autonomy is a very important factor in influencing motivation.It will make a combination between learner autonomy and motivation in SLL to find some new ways of promoting learners' motivation and learning efficiency.A survey methodology has been employed which consists of qualitative and quantitative methods.Specifically,both questionnaire and interview have been conducted in the research.