The effects of harmful pollutants in domestic drinking water and their harm to paper fibers, based on the analysis of domestic and foreign literature and related investigations, are summarized. In discussions of the use of water for paper restoration, it is pointed out that purified water (obtained via reverse osmosis and deionization, etc., of sufficiently high resistivity) should be selected for this purpose. It is better to use ultrapure water with higher resistivity where possible. In order to ensure that purified water is not re-contaminated after purification, it should be used right after being made. In terms of equipment, selection of a small pure water system can ensure better water quality.