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The structural diaphragm effects have been investigated in the past decades with major attention on the properties of diaphragm panels. The research observations made by the oversea researchers cannot be directly utilized to the design construction of Chinese light gauge steel structures due to the different configuration of profiled steel sheets, fasteners, and purlins in China. In this regard, the shearing strength and stiffness of diaphragm steel sheets are investigated in this study through numerical study. The profiled steel sheet and fastener are simulated by the ortho-anisotropic flat plate and three one dimensional nonlinear spring, respectively. The analytical models are developed for examining the shearing strength and stiffness induced by diaphragm effects of a cladding system. The made observations indicate that the diaphragm effects of the steel sheet on the structure are obvious.