Abstract: Silver resin is aontactype disinfectant formed by absorption of silver ions on strong acid cation-exhange resin Improved siliver resin is the siliver resin which added some reduring agent acxording to the principle of silver-mirror rearaction while it was producld.It is mainly used for disinfection of drinking water.Examination indicated that the improved silver resin could remove and kill more than 99.9% of Escherichiacoli, Staphylococxus aureus and Candida albicans in 25℃,pH6.5 water after contact for 1.353sec，1.962sec and 2.050sec respectively.Improved silver resin can efficiently remove and kill microorganisms in water. The disinfection effect on Escherichiacoli, Staphylococcus aureus and Candida alhicans etc. by improved silver resin were different. The reason of the dlfference may be the different isoelectric points of the different microorganisms. Tests for influence factors indicated that the removing and killing rate of microorganisms in water by improved silver resin increased with increasing pH value or contact time, and decreased with increasing water turbillity and the count of microorganisms in water.