In order to study the construction of the cover beam support scheme for cross box beams, this paper combines the actual situation and designs two types of beam column support schemes, namely "single span double layer Bailey beam" and "three span single layer Bailey beam". The rationality of the support scheme is compared and analyzed from the aspects of engineering cost, construction period, and technical operation. The feasibility of the support scheme is analyzed through numerical simulation to determine the most suitable support scheme. Through comparative analysis, it was found that the "single span double-layer Bailey beam" support scheme, although it can meet the needs of on-site safety construction, is very expensive in cost and technically difficult to operate, and is not the optimal solution; The "Three span Single layer Bailey Beam" support scheme can use the already installed box beam as the foundation, shorten the span of the support, reduce the number of Bailey pieces, significantly save project costs, and is also much more convenient in technical operation, which can provide reference for similar projects.