This study is to evaluate whether peer evaluation increases student participation and thus improves learning achievement in an e-learning 2.0 environment. We first implemented an e-learning 2.0 platform and then collected data from student participants, including RSS, blogs, Wiki, and other online forums. A quasi-experimental design was used in the study. The student participants were divided into an experimental group (N=52) and a control group (N=60). The results indicated that the e-learning 2.0 platform had a positive effect on student learning process. When comparing the academic performances of the control group and the experimental group after using e-learning 2.0 for a period of time, students in the experimental group had significantly better academic results than those in the control group.