Abstract: Aim To design and implement a distributed multi knowledge source cooperative expert systems developing tool Methods Adopting the multi knowledge source cooperative method,based on the blackboard system under distributed network environment,a distributed cooperative expert system tool is developed Results A distributed cooperative expert system tool under TCP/IP network environment is realized The tool consists of a blackboard system with a Sun workstation and several Windows95 microcomputers expert system tool working as its knowledge source nodes Conclusion As an illustrative instance of application,the Chinese medical diagnosis system designed by such a tool is given as example