Based on the theory and formulas of the technical code for building pile foundations, the formulas for the characteristic value of the vertical bearing of the minisize bore steel tube cast-in-site pile embedded in rock are concluded. Combined with the engineering example, the whole design process of strengthening is introduced. It can be referred for similar projects＇ application.%以《建筑桩基技术规范》相关的理论和公式为基础，将其应用于微型钻孔嵌岩钢管灌注桩的竖向承载力特征值的计算公式，并结合实际工程算例，对桩基的整个加固设计过程进行系统阐述，为类似的工程应用提供借鉴。
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