受扫描仪到扫描物体的激光测距值、激光入射角、大气衰减等因素的影响，相同目标的激光强度存在较大偏差。从激光雷达测距方程出发，分别对激光强度的距离效应和角度效应进行改正。激光强度与激光入射角的余弦大致呈线性关系，但激光强度的距离效应较为复杂，激光强度总体上不与距离的平方呈反比，因此提出了一种利用分段多项式模型来消除激光强度距离效应的方法。实验表明，提出的改正模型能对点云激光强度进行有效补偿，通过将激光强度分别进行角度改正和距离改正，能够有效消除由距离和入射角引起的强度偏差，使同类物体的激光强度趋于一致。

The laser intensity of same targets may vary significantly due to the influence of laser measuring distance between scanner and object, laser incidence angle, and atmospheric conditions, etc. The distance effect and incidence angle effect are corrected based on the laser radar range equation. The laser intensity is linearly proportional to the cosine of the incidence angle. However, the distance effect of laser intensity is more complicated, and the laser intensity is not inversely proportional to the square of the distance. Therefore, the sectional polynomial model is proposed to correct the distance effect. The experimental results indicate that the proposed model can effectively compensate the point cloud laser intensity. The deviation of intensity caused by the distance and incidence angle can be removed effectively with angle correction and distance correction, which makes the corrected laser intensity of the same target tend to be consistent.