Based on the relationship between infinite points and camera intrinsic parameters, a calibration method for camera intrinsic parameters and image distortion was proposed, which can realize a decoupled calibration among intrinsic parameters, image distortion and extrinsic parameters. First, solving camera intrinsic parameters from the projective equations of image of absolute quartic. Second, taking a reprojected point as an ideal image point and solving image distortion coefficient. Third, taking homography among sequence images as parameters to be optimized and taking reprojection error as cost function, then the final outputting results include camera intrinsic parameters and image distortion coefficients. Under the identical configurations, the calibration precisions of the proposed method and Zhang′s method were simulated respectively and compared together. By using the 27 views of planar objects with different pose, the calibration experiment for the camera intrinsic parameters was conducted by the proposed method and Zhang′s method respectively. The results show that, the calibration precision of the proposed method is improved at least 1% to compare with Zhang′s method. In the calibration experiment, the reprojection error of Zhang′s method and proposed method is 0.064pixel and 0.008pixel respectively.