Aiming at correcting the digital two-dimensional rotating-mirror’s angle and the actual image motion reading inconsistencies on optical scanning, in this paper reading correction method is proposed based on optical transmission matrix. First of all, according to the principle of two-dimensional turntable alignment readings detection, mathematical model is set up. The corrected pitch angle and azimuth of the emitted light is obtained. In order to verify the model, the emergent light direction for proofreading is revised by using high precision theodolite. In the experiment, this method improves the two-dimensional mirror reading error to 4" without increasing the precision of installation.