Taking some open excavation station as the example,the paper selects common pile types with 800 mm and 1 000 mm pile diameter to undertake the calculation by combining with the adoption of the bored pile at the main enclosure structure,has the technical and economic com-parison for the pile diameter,pile distance,reinforcement,and deformation by meeting the demands for the enclosure structural stress and de-formation,and selects the bored piles with the diameter of 1 000 mm of the enclosure piles of the station,so it optimizes the design.%以某地铁明挖车站工程为例，结合主体围护结构采用钻孔灌注桩的情况，选用常用的直径800 mm 和1000 mm 的桩型进行计算，在满足围护结构受力及变形的条件下，通过桩径、桩间距、配筋、变形等进行了技术经济比选，最终选取了车站的围护桩为1000 mm 钻孔灌注桩，优化了设计。
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