The invention discloses a method for interchanging designs by using a general model of an intelligent device. By the method, designs of devices are interchanged by using a type model. A designer designs a secondary system by using the type model, performs substation configuration language (SCL) modeling by importing an interface control document (ICD) of every factory and performs peer-to-peer operation on the basis of a complete semantics congruent relation base to finish the generation of an SCD document. The method provides means for achieving the design depth of the secondary system in a primary stage for a designing institute, ensures a primary design scheme is more accurate, enhances the role and function of a designing unit in the construction of an intelligent transformer substation from the source, and provides secondary communication integration intervention capacity and means for a designing department; and the secondary communication process of the transformer substation is controlled from the source, and the integration normalization and standardization of the secondary system of the transformer substation, the coordination of mounting and adjustment, and the expansion and reconstruction of the transformer substation and the update of equipment of the transformer substation in future are facilitated.