Computer supported cooperative work (CSCW) provides a technology to design the medical information systems that allow doctors located in distributed locations to carry on the cooperative healthcare processes. This paper describes the design and development of a cooperative distributed dental medical system for remote computer-supported cooperative medical diagnosis. The system is based on a multilayers distributed architecture, and is comprised by a collaborative toolkit of the videoconference tools, the cooperative dental medical imaging diagnosis tools and the electronic patient records. The system can be applied to setup a cooperative dental medical imaging diagnosis environmental that allows doctors located in different hospitals to achieve a cooperative diagnosis through the dental images tools, telemedicine, electronic patient records (EPR) and video-conference. The system would have very important application value and practical prospect in cooperative dental medical health care processing.