Superlarge span structure is one of the important trends for future building development. Under the background of the 800-meter\nsuperlarge span dome project proposed by China Construction Group, this paper focuses on the structural optimization and\nperformance analysis of this superlarge span structure. The previous ideas of the superdome and the maximum span of existed\nspatial structures are reviewed, and some structural form selection principles are put forward which lay foundation for structural\nselection. The applicability of high-strength steel and aluminum alloy is also discussed. It is demonstrated that the high-strength\nsteel and aluminum alloy contribute little to structural comprehensive performances. Then, considering the effects of grid division,\nmembers topological relation, and surface shape, six kinds of rigid systems are contrastively studied to determine the optimal\nscheme. The structural performances along with the increasing span are explored in detail. To further reduce the structural weight\nand improve mechanical performance, a new composite scheme and the cable-stayed megastructure are proposed and studied.\nThe research methods and performance analysis results can provide significant references for the following research on the\nsuperlarge span structure.
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