通过现场实测和共同作用计算结果的分析，探讨超长桩的持力层问题，差异沉降太大的处理办法．通过研究超长桩箱（筏）基础的变形机理，提出新的沉降计算方法，计算结果与实测结果比较相符．最后本文明确提出了用容许沉降控制的超长桩箱（筏）基础的变形控制设计方法，以供工程界参考． Through the analysis of field measurement and joint calculation results, the problem of bearing layer of ultra-long piles and the method of dealing with the large differential settlement are discussed. By studying the deformation mechanism of super-long piled box (sluice) foundation, a new settlement calculation method was proposed. The calculated results are in good agreement with the measured results. In the end, this paper clearly proposes a deformation control design method for the super-long-pile box foundation with allowable settlement control for reference in the engineering community.