Abstract: Objective To explore how to remove CT ring-shaped artifact quickly and effectively, and to improve accuracy of CT reconstruction image. Methods CT graphics (including the ring-shaped artifacts) were used first in coordinate transformation with a new transformation method. A two-dimensional filter was designed to filter the image. Then, a one-dimensional filter was used to re-filter the image. Finally, a new transform method was used to restore the image. Results The two-step coordinate transformation of ring-shaped artifact algorithm resulted in accurate restored original CT image, effectively reducing its interference on useful information. Conclusion The method described in this study can overcome disadvantages of existing methods and obtain good results.