This research is to examine the students‘motivational factors and attitude towards the learning ofEnglish grammar in a Computer-supported LearningSystem. Twenty-nine students were taught with astudent-centered approach and three grammar learningweb sites were used frequently for classroom andindividual English grammar practice, whereas anothertwenty-nine were taught with the traditional teachercenteredapproach. Both groups were given grammarcorrection and explanation tests before and after thestudy. After comparing the results of the pre-test andpost-test with those of the control group, it was foundthat the experimental group excelled over the controlgroup in both grammar correction and grammarexplanation. It proved that students‘ implicit andexplicit knowledge on English grammar was greatlyimproved by the computer-supported teaching methodsand environment. Further interviews with the studentsalso revealed that the new pedagogical practice hadprovided many positive motivational factors insupporting students‘ learning process.Keywords: motivation, grammar, computer-supportedclassroom.