The invention discloses a method for unified communication between multiple medical information systems. In accordance with the method of the invention, an isomerous gateway pool comprises multiple servers connected to the clients ports of various medical information systems via network ports. The network ports of a the gateway pool are connected to a network interface module and the information of various medical information systems is transformed by the servers via information analysis modules and information building modules into information conforming to an international electronic medical information standard. The information is then intercommunicated between various medical information systems. By applying the method taught by the invention, the intercommunication of information between various medical information systems is realized, and the problem of Information Island is solved, the work efficiency of medical systems is increased largely, and the information communication between various medical systems is improved, which is beneficial to the patients and the development of the medical profession.