HDR is a new technology focused on restoring damaged historical documents, aimed at predicting their original appearance. This technology utilizes the HD28K large-scale dataset and the diffusion-based network, DiffHDR, to address various damages including character loss, paper deterioration, and ink erosion. The primary advantage of HDR is its ability to accurately capture character content and style while ensuring coherence with the background of the restoration area. This technology not only restores damaged documents but also extends to document editing and text block generation, showcasing high flexibility and generalization capabilities. HDR holds significant importance for preserving invaluable culture and civilization.