Hexazolol is a new generation of triazole high-efficiency bactericide developed after Triadimefon, diniconazole, tebuconazole, Difenoconazole and propiconazole. The bactericide was successfully developed by 1ciagrochemicals in the UK. It has obtained patents ep110536 (1985) and fr2469408 (1981). The biological activity and bactericidal mechanism of hexazolol are similar to that of Triadimefon and triazolol. It has the characteristics of wide antibacterial spectrum, strong permeability and internal absorption conductivity, and good preventive and therapeutic effect. The action mechanism is to destroy the chemical book and prevent the ergosterol biosynthesis of bacteria, resulting in the failure of the formation of bacterial cell membrane and the final death of bacteria. Hexazolol can effectively prevent and treat diseases caused by Ascomycetes, basidiomycetes and semiotics, especially diseases caused by basidiomycetes and Ascomycetes, such as powdery mildew, rust, scab, brown spot, anthrax, sheath blight and rice false smut, but hexazolol has no effect on oomycetes and bacteria. The application of the recommended dose on suitable crops is environmentally friendly and safe for crops, but sometimes it is harmful to some apple varieties.