Low concentration can quickly kill various bacterial propagules, fungi and viruses, and has special effects on hepatitis virus. It has the characteristics of high chlorine content, strong bactericidal effect, simple process and low price. The toxicity of sodium dichloroisocyanurate is lower, and the bactericidal effect of Chemicalbook is better than that of bleaching powder and chloramine-T. Mix metal reducing agent or acid synergist with potassium permanganate and sodium dichloroisocyanurate dry powder to make chlorine fumigant or acid chlorine fumigant. Such fumigants produce gas with strong bactericidal effect after being ignited.