The GaoFen-7 satellite (GF-7) is the first 1:10,000 scale stereo satellite independently developed by China. The full-waveform laser altimeter and dual-linear array camera carried by the GF-7 provide a new way of establishing worldwide digital elevation models. The active and passive composite mapping function of the laser footprint and dual-linear array stereo image can be fulfilled when the position of the laser footprint in the dual-linear array stereo image is determined. To this end, the laser footprint camera monitoring the laser pointing needs to work simultaneously with the dual-linear array camera in the daytime to determine the laser spot position in the image coordinate system of the dual-linear array camera. Due to the operating characteristics of the laser footprint camera in the synchronous exposure mode, the spot image overlaps with those of ground objects or clouds. With strong background noise, either the spot center position obtained from an image captured by the laser footprint camera is poor in accuracy, or no spot center position is obtained. According to an analysis of multi-track images captured by the laser footprint camera, when the laser works continuously, the spot center shifts in the positive X direction with the increase in working time and presents linear characteristics that are affected by fluctuation of laser output energy. In contrast, it is stable in the Y direction. Piecewise linear fitting and data interpolation can be used to obtain the spot center position under strong background noise and thus to greatly improve the utilization efficiency of laser data. The variation law of laser pointing not only serves as a reference for later calibration and calculation of systematic errors in laser pointing but also provides a new idea for the analysis and processing of laser altimeter data in the future.