To overcome the problem of Shu Xuan paper with ancient drawings becoming brittle after conservation, accelerated aged Shu Xuan paper was used as a sample for de - acidification experiments on ancient drawings and paintings made on Xuan paper. Following the Minimal interventional Principle for culture relics, the Shu Xuan paper was de - acidified by controlled washing using ultra - pure water as solvent. The results of pH value, color difference measurements and the folding endurance of the paper suggest that this method can reduce the damage to Shu Xuan paper while not introducing new impurities. The method is also environmentally friendly and of low cost.