The aim of this study was to examine effects of chat-based on-line CBT on a university student's study related behavior and anxiety. The study used a single participant multiple baseline design across three self-recorded behaviors consisting of hours of study, number of pages read, and note-taking quality, accompanied by recordings of daily anxiety levels. After baseline, the participant received 6 × 45 min weekly chat-based on-line sessions of CBT. Results show that the three study behaviors increased, and anxiety decreased. These results appear comparable with those of conventional face-to-face CBT for similar problems, suggesting that chat-based on-line CBT may be an alternative for clients with accessibility or anonymity concerns.