Abstract: Aim To implement two Chinese medical diagnosis expert systems having the power of cooperative problem resolving,using the distributed cooperative expert sys tem developing tool Methods Choosing the expert knowledge of Chinese medical diagnosis on tussis,a cooperative knowledge expression architecture is established Rules and facts of cooperative objectives are then established respectively Results The system achieves the goal of cooperative problem resolving,so that a single expert can solve problems beyond his ability through the help of sharing knowledge and coordination with other experts Conclusion The cooperative problem solving mode of multiple expert systems effectively fills the gaps of incomplete knowledge in ways of reasoning