This paper presents a case study of applying problem-based learning in the format of web-based environment. It first describes the features and rationale behind problem-based learning approach, and then introduces the development of web-based environment as well as its implementation of a university classroom in facilitating students' teamworking. It then discusses results of the evaluation conducted to understand the effectiveness of this technology application. Findings show that most students have positive attitude toward this application, and they think the system can help their team-working in the problem-based learning process. Also students' feedbacks demonstrate that their learning from the web-based problem-based learning approach is significantly improved.