通过对前人研究成果和土钉墙的实际位移的分析，定性地论述了土钉墙的侧向土压力的分布，然后根据莫尔—库伦强度理论从理论上论述了土钉墙的主动土压力的分布和大小，最后通过实测的侧向土压力，提出一种有效的侧向土压力简化模式，为土钉墙设计的进一步优化提供有力的依据。

The paper analyses the investigation of father and the displacement in fact, discusses the distribution of the lateral soilpressure in soilnailed wall qualitatively , then discusses the distribution and the magnitude of the active soilpressure in soilnailed wall in theory, in the end it brings forward an effective predigested mode of the lateral soilpressure in soilnailed, it supplies a forceful gist to optimize the design more of the soilnailed wall.