PURPOSE: A synergistic antibacterial composition containing flumetsulam or dichlorosulam and diiodomethyl-p-tolylsulfone is provided to ensure excellent antibacterial activity. CONSTITUTION: A synergistic antibacterial composition contains flumetsulam or dichlorosulam and diiodomethyl-p-tolylsulfone. The weight ratio of flumetsulam and diiodomethyl-p-tolylsulfone and dichlorosulam and diiodomethyl-p-tolylsulfone is 8:1-1:15 and 12:1-2:1 or 1:1.5-1:15. The composition is used as a construction material including paint, coating, polymer, plastic, synthetic or natural rubber, paper product, fiber glass sheet, insulation material, roof and bottom pelt, building plaster, or wood-plastic synthesized material.플루메트설람 또는 디클로설람； 및 디요오도메틸-p-톨릴설폰을 함유하는 상승적 항균 조성물이 제공된다.
