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.