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Aiming at the high precision image needed in the special application scene of linear array camera, the linear array camera is calibrated with high precision. Propose a calibration method for dual line array cameras based on beam adjustment.Pixel coordinates of feature points of linear array camera are obtained by background difference method.By using the existing direct linear transformation method and nonlinear optimization method, the internal parameters, external parameters and distortion parameters of the camera are obtained, and the initial parameters and world coordinates are taken as the set to be optimized. The LM method and the beam method are used to further optimize the set, so that the reprojection error of the two-linear array system is minimized.Experiments show that this method reduces the reprojection error compared with the traditional linear array camera calibration method.