A computerized tomography artifact correction method includes: receiving scanning data; reconstructing an image to be corrected and a reference image of the image to be corrected based on the scanning data; determining proportions of a first substance for pixels of the reference image; obtaining a base image of the first substance based on the proportions of the first substance; performing a projection of the base image of the first substance and the reference image to obtain a plurality of projection lines; for each of the plurality of projection lines, obtaining an equivalent length of the first substance corresponding to the projection line and selecting a hardening correction coefficient based on the equivalent length of the first substance corresponding to the projection line; and performing an artifact correction on the image to be corrected based on the hardening correction coefficients.