Formaldehyde (HCHO), commonly used in construction and furnishing materials, is a major indoor air pollutant in air-tight houses. In this research, ion exchange groups were introduced into an existinf microfiltration non-woven fabric by radiation-induced grafting polymerization and subsequent chemical modification. Glycidyl methacrylate(GMA) was grafted onto the porous polypropylene non woven fabric. The epoxy group produced in the GMA-grafted non woven fabric was converted into anion-exchange groups by reaction with diethylamine(DEA), hydroxylamine(HA) and Triethylamine(TEA). Subsequently, HA non woven fabric adsorption of formaldehyde better then DEA, TEA non woven fabric.