The invention relates to a multidisciplinary co-simulation architectural method. Standard or secondary development interfaces and proxy interfaces corresponding to commercial engineering software are independently distributed; interdisciplinary information interaction and interoperation are achieved for the commercial engineering software through a soft-bus platform; the problems that the interfaces provided by the commercial engineering software are unable to be inter-versional and software distributed layout is unsupported during multidisciplinary co-simulation are solved; multidisciplinary co-simulation availability of the commercial engineering software is enhanced. According to the method, the commercial engineering software are organically connected through an HLA/RTI (high-level architecture/run-time infrastructure) soft-bus platform, thus multidisciplinary co-simulation can be better supported, and design efficiency of and confidence level of a complex system are effectively ensured; software sub-systems are all independent in the physical layer, thus the amount of the sub-systems is convenient to increase and extensibility is good.