Abstract: Quartz sand filtration with added ingredients was used to purify polluted NHD solution (a decarburizing/desulfurizing reagent mainly consisting of polyethylene glycol dimethyl ether，developed by Nanjing Chemical Industry Company). Quartz sand particle size of the filter was 0.60～0.80 mm，the thickness of the layer in the bed was 600mm.The ingredients were used to modify the surface of the solid impurities of the polluted NHD solution. The influence factors of filtration effectiveness，including ingredients particle size，the amount of ingredients，operating pressure were studied. The optimal condition of the filtration for polluted NHD solution being added in ingredients was determined. The experimental results showed that: at room temperature，ingredients particle size of 20～25μm，the amount of ingredients was m(ingredients): m(solid impurities)＝0.32，operating pressure = 0.03MPa，solid impurities removal was up to 92.3%，and the absorption property of NHD solution remained unchanged.