This research aimed to investigate the effectiveness of Learning Center (LC) to improve students's TOEFL score. Learning Center was designed as a site where students were able to learn TOEFL by computer-based. The research participant involved six classes in each departement, State Polytechnic of Bali. The students were trained on Learning Center (LC) program and given chance to study TOEFL test in whole part by their self or individually. To measure its effectiveness, two test were applied, those are pretest and post-test. The treatment in Learning Center (LC) was done two times. The result of pre-test and post-test were compered and analyzed. The test and Learning Center (LC) material were developed and validated by the experties before used. The result of measurement fostered that the Learning Center (LC) was effective to improve the TOEFL score by the students.