This paper studies the reasons of the differences in students’learning outcomes. The research is based on the theory oflearner differences and second language learning, and the "GoodLanguage Learner" studies. It approaches the interrelationbetween learning skills and learning outcomes. Through adetailed investigation and discussion, this paper aims to presentwhat the students really want to get from their English teacher,and the general characteristics of successful language learnersand unsuccessful language learners, and to serve as a guide forEnglish learners, especially for unsuccessful learners. Twoexperiments were carried out in the research. One was CollegeEnglish Test Band 4, CET 4, which indicates the differences inlearning outcomes of students who were taught by the sameEnglish teacher. The other was a questionnaire to investigatelearners’ differences in learning skills and learning habits. Theresults gained from the two experiments prove that there existsignificant interrelation between learning skills and learningoutcomes. The thesis is beneficial to both English teachers andEnglish learners.