The bactericidal effect of CMIT-MIT is achieved by destroying the combination between bacteria and algal proteins. When in contact with microorganisms, CMIT-MIT can rapidly inhibit their growth, resulting in the death of these microorganisms. CMIT-MIT has a strong inhibitory and bactericidal effect on common bacteria, fungi and algae, and has the advantages of high bactericidal efficiency, good degradability, no residue, safe operation, good compatibility, good stability, and low operating cost. CMIT-MIT can be mixed with chlorine and most cationic, anionic and nonionic surfactants. At high dosage, its biological sludge stripping effect is good. CMIT-MIT is a broad-spectrum, high-efficiency, low-toxicity, non-oxidizing fungicide, and is an ideal fungicide for industrial circulating cooling water systems and wastewater treatment in oil fields, papermaking, pesticides, cutting oils, leather, detergents, cosmetics, etc. .