The large field optical theodolite is an important test equipment for the shooting range. Usually， the full-field angle measurement error of the large-field optical theodolite is corrected by using the partition modeling error correction method based on the true value of the light pipe. In order to improve the full-field angle measurement accuracy of large-field infrared theodolites， this paper proposes a divisional error correction method that relies on the theodolite's pointing value as the reference value for optical calibration. Two different correction methods based on the true value and the pointing value are used to construct two correction models respectively， solve the spatial angle of the same measured target， and carry out comparative experiments. The results show that the divisional error correction method based on the pointing value can obtain better angle measurement accuracy.