Abstract: This study aims to addresses Taiwanese adolescent students’ perceptions of cyber-plagiarism. In this study, we conducted the survey method to collect our data. A total of 125 paper-and-pencil questionnaires were distributed to adolescent students in Taiwan. Findings indicate that adolescent students can’t clearly understand learning purpose and how to use the Internet information properly. In the conclusion, this study suggests that teachers should pay much more attention to students’ interpretation of copy-and-paste, and students’ mode about copy-and-paste should be taught correctly in order to prevent cyber plagiarism.