针对联合迭代重建技术(simultaneous iterative reconstruction technique,SIRT)应用于近地表层析成像时,由于系数矩阵A与旅行时残差Δt不完全匹配而易出现修正过度的问题,本文提出一种改进的SIRT算法.用炮点与检波点的距离d修正约束旅行时残差Δt,改进了A与Δt的匹配性较差的问题.验算结果表明:该算法能够有效地抑制修正过度现象,而得到较好的重建图像. For the simultaneous iterative reconstruction technique (SIRT) applied to near-surface tomography, the problem of overcorrection easily occurs because the coefficient matrix A does not exactly match the residual Δt when traveling. This paper presents an improved SIRT Algorithm is used to correct the residual Δt of constrained travel by using the distance d between the shot point and the detection point, which improves the problem of poor matching between Δ and Δt.The experimental results show that the algorithm can effectively restrain the overcorrection phenomenon and get better Reconstructed image.