In order to solve the imaging position error of the short focal length wide field of view infrared theodolite, which is caused by optical, mechanical, alignment and other factors in the actual production process, this article used the idea of partition processing that the image is divided into multiple zones, and then least squares linear processing is performed in each zone. We can obtain the desired fit parameters, which can be used to validate the calculation on the back of the validation data. Results of the experiment show that this method can improve the full-field measurement accuracy.