Through the contrast of the line selection, construction and actual investment and the bidding number design of one large temporary sidewalk of tunnel, this paper conducts the investment analysis in accordance with the principles of the railway budget preparation, provide to reference for reasonably determining the size and standard of large temporary sidewalk, seriously doing well the design and reasonably preparing engineering estimates.%通过对某长大隧道大临便道的选线、修建及实际投入与招标设计数量的对比，依据铁路概算编制原则对其进行投资分析，为合理确定大临工程的规模和标准，认真做好大临工程设计，编制合理的工程概算做参考。
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