In recent years, metal nanostructure has had rapid development and application in novel optical sensor, filter , optical transparent electrode and other fields, so the study for the design of metal composite nanostructures and the design’s optical characteristics not only has laid the foundation for extraordinary optical transmission (EOT), but also had important significance in the development of optical devices mentioned above all. This paper uses the method of finite difference time domain (FDTD) to calculate the three-dimensional the double square ring metal nanocomposite structure models. We studied a series of factors, such as the parameters of the metal silver film, the groove width and the incident plane wavelength, and so on. As the result of our study, we found that the light transmission intensity of this composite structure is much higher than separated large or small hole array structures. It’s because the resonant excitation of the composite surface plasmon polaritons (SPPs) and the strong coupling are more remarkable in the double square ring structure. Through the study of kinds of composite structures, we discovered that some small holes to be cut in the metal film structure will be more conducive to the light transmission intensity. It is a great potential value in the research and development of optical devices.