Compared with other supporting form, pile anchor support has the advantages of strong ability to control soil deformation, construction is convenient , small supporting space and so on. In this paper, with the Foshan CBD deep foundation as an example, Combined with monitoring data, the causes of deformation of the deep foundation pit with pile anchor exceeds the early warning value are analyzed, and the corresponding suggestions are presented, at the same time the safety of the foundation pit is evaluated, and then provide reference for similar foundation pit engineering in the future.%桩锚支护相对其他支护形式具有控制土体变形能力强、施工方便、支护空间小，本文以佛山新城CBD项目基坑为实例，结合监测数据对桩锚支护深基坑变形超预警值的原因进行分析并提出相应的处理建议，同时对整个基坑安全进行评价，从而为以后类似的基坑工程提供参考和借鉴。
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