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In engineering, network reliability of data communication is often determined by data network structure. For instance, 1553B bus with some nodes could be designed into a one-layer bus structure with a BC node and some RT nodes. It also could be designed into a two-layer BC-RT bus structure. Therefore, it is a crucial question that how could these two kinds of design be compared for network reliability. In order to solve this problem, this paper makes this problem of bus structure design as a breakthrough point, combines principle of inclusion-exclusion and bus structure characteristics, and provides a group of network reliability evaluation models which could be used to evaluate, compare and analyze network reliability of one-layer and two-layer 1553B bus structure. This paper could guide to choose and use network reliability evaluation models in engineering, give quantitative data support to reasonable data network structure design, and provide theoretical proof to satisfaction of network reliability design requirements. At last, the developing trends of bus design network reliability research will be discussed.