With the requirement of economic development, English has become more and more important that people begin to learn English with fully enthusiasm even from younger age. Learning a foreign language is not a simple and easy job but sometimes it is boring and dull. Motivation is critical in English learning, thus, how to effectively motivate students in English learning is an important problem. This paper expounds this importance and ways to motivate students. First, the author shows the definition of motivation and then explains intrinsic and extrinsic motivation and their relations, following with some personal factors that influence motivation. At last, according to the rationale, the author suggests several effective ways to motivate students in English learning.