A novel anion exchange resin which has triethylamine as functional group has been synthesized by the reaction of chloromethylated polystyrene-divinylbenzene copolymer and triethylamine in ethanol, while commericial resin has trimethylamine as functional group. The fundamental properties such as bulk density, water content, appearance index, exchange capacity, effective size, uniformity coefficient of synthesized anion exchange resin have been measured. The resin exhibited the better selectity for nitrate than sulfate in both batch and contineous column experiments.