为减少抗浮设计不合理而引发的地下结构破坏，将抗震与消防工程设计理念引用到抗浮设计中。基于抗震设防设计理念与抗浮锚杆锚固的工作机理，提出了地下结构的抗浮锚杆系统中三水准设防设计方法，并明确了该设计方法的实施思路。通过地下结构的抗浮锚杆系统中三水准设防设计方法，以写字楼地下室的抗浮锚杆失效工程为案例，研究了抗浮锚杆设计的优化方案，确定了三水准设防设计理念下的锚固件长度、锚杆抗拔承载力、锚杆间距等参数。最后，结合该写字楼地下室的失效工程进行验证。结果表明：通过进行局部、整体抗浮设计验算，中庭锚杆整体稳定性验算，中庭范围柱下独基冲切验算及底板与独基交接处抗剪验算，验算结果均满足设计要求。可见，在地下结构的抗浮锚杆系统中，应用三水准设防设计方法可为地下结构抗浮锚杆系统安全管理提供依据。

In order to reduce the damage of underground structure caused by unreasonable anti-floating design, the design concept of the anti-seismic and fire protection engineering was introduced into anti-floating design. Based on the concept of earthquake resistance and the working mechanism of anti-floating anchor, the three-level protection design method for anti-floating anchor system of underground structure was proposed, and the implementation idea of the design method was clarified. The three-level protection design method of the anti-floating anchor system in underground structure was utilized to study the optimization scheme for anti-floating anchor design, using a case study of the failure engineering of anti-floating anchors in the underground basement of a specific office building. This research determined parameters such as anchor fastening item length, anchor pull-up bearing capacity, and anchor spacing under the concept of three-level protection design. The results were verified by combining them with the failure engineering of the office building's underground basement. The findings indicate that both local and overall anti-floating design calculations, as well as stability calculations for atrium anchors and shear calculations at column base joints within the atrium range and at bottom slab-isolated base junctions, all meet design requirements. It is concluded that the three-level protection design method for anti-floating bolt system of underground structures provides a basis for the safety management of anti-floating bolt system.