In order to overcome the difficulty during measuring the external parameters of the camera with a long object distance, a calibration target bar was used as a medium. Its precision can be verified by the binocular vision measurement. By means of analyses of the influence of the cooperative targets’ coordinate in the world coordinate system on the internal and external parameters of the camera, the influence of the measured cooperative targets’ coordinate by the binocular vision measurement can be determined. The result shows that the geodetic coordinate error of the cooperative targets in the calibration target bar can affect the measurement error of the measured cooperative targets. The result shows that, for the propose that the measurement precision requirements of the cooperative targets should reach 10 mm, the X axis precision requirement should be 0.621 9 mm, the Y axis is 13.341 2 mm, and the Z axis is 0.729 1 mm.