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Helical CT reconstruction is affected by cone beam artifacts and windmill artifacts; cone beam artifacts are caused by excessive cone angle and pitch, while windmill artifacts are caused by insufficient sampling in the longitudinal direction. In order to reduce the effects of cone beam artifacts and windmill artifacts on CT images, a helical CT artifact correction algorithm is proposed; firstly, the 3D weighted helical FDK algorithm is used for reconstruction to effectively remove cone beam artifacts from the reconstructed images. Then an improved dual-domain filtering algorithm is used to correct the images containing windmill artifacts; the 3D weighted helical FDK algorithm suppresses cone beam artifacts by giving unfavorable weights to rays with large cone angles, and the improved dual-domain filtering algorithm can preserve more details while removing windmill artifacts; the computer simulation experimental results show that the algorithm can effectively suppress cone beam artifacts and windmill artifacts in the reconstructed images and improve the CT The results of computer simulation show that the algorithm can effectively suppress the cone beam artifacts and windmill artifacts in the reconstructed images and improve the quality of CT images.