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Measuring cameras,including visible light camera and near-infrared camera,are used for imaging measurement of vertical target illuminated by a laser irradiator. The visible light camera is used to capture moving targets,and the near-infrared camera is used to take laser irradiation. For the problem that the cassegrain optical system makes the image distorted during measuring and the optical axes of two cameras are not strictly consistent,the influence of the perspective error is neglected in the long-distance measurement,Zhengyou Zhang camera calibration method is improved,so that the distortion factor in the camera parameters is zero and the camera calibration is realized. A near-field calibration method for camera far-field imaging is proposed. According to the spatial perspective relationship between the imaging planes of visible light camera and near-infrared camera, a dual camera axis consistency calibration method is proposed. The re-projection error of visible light camera calibration is 0. 08 pixels,the re-projection error of near-infrared camera calibration is 0. 19 pixels,and the camera registration axis consistency accuracy is 0. 37 μrad,which meet the needs of laser irradiator irradiation accuracy field test. [ABSTRACT FROM AUTHOR]