The purpose of this study is to evaluate the effect of utilizing learning website on the learner¡¦s performance. We chose the learning website of Koa-Yuan university as an experimental platform and investigated student performance in the ¡§Copywriting¡¨ course. Task-Technology Fit¡]TTF) model was used to develop the research framework. We also add ¡§expert guidance¡¨ into this experiment as a moderating variable. The experimental result shows that task characteristic and technology characteristics well explained the perceived task-technology fit. For all students, the fit level impacts on their learning performance. In the TTF factors, ¡§relationship with users¡¨,¡¨ timeliness¡¨, and ¡§quality¡¨ have more influence on learning performance. For students with ¡§expert guidance¡¨, the effect of ¡§relationship with users¡¨, and ¡§quality¡¨ were significant; while ¡§relationship with users ¡¨and ¡¨ timeliness¡¨ were significant for students without ¡§expert- guidance¡¨.