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According to the operational conditions of an aviation module reticule,a measurement mode is proposed,which is based on an industrial photogrammetry system,with matching by a measuring pen.Meanwhile,the factors affecting the accuracy of the measurement have been analyzed and verified by examples.The analysis is described as follows: ① Along the optical axis of the camera,the error is larger than the ones in other directions using the “single camera + measuring pen” mode;② By avoiding the error along the optical axis of the camera,the accuracy of the “single camera + measuring pen” mode is better than 0.1 mm when the measuring pen is moving parallel to the optical axis.