Collaborative design is considered a useful teaching strategy in design education. The accessibility of the Internet and the rapid development of information technology have greatly facilitated design students to learn and practice design with professional designers and peer students off campus. The purpose of this paper is to discuss the influences and problems in using Internet to mediate the design studio course. Two collaborative design projects conducted by the authors between design departments of two universities in Taiwan were exemplified. Opinions of the students collected with a questionnaire survey were analyzed and discussed to supplement the observations and subjective reflections of the instructors (experimenters). The results showed that the learning process was influenced and the difficulties encountered consist of both technological and human factors. In general, the participants are positive toward online collaborative design in design process and design thinking.