The invention provides a sterilization composition comprising the following 
active components with effective quantity: flutolanil and one of 
triazole class compounds of hexaconaole, ethyltrianol, diniconazole, triazolone, triadimenol, 
epoxiconazole, fluquinconazole, 
flusilazole, systhane, penconazole, tetraconazole, 
biphenyl triadimenol and cyclopropyl 
hexaconazole. The composition can be used forpreventing and treating diseases caused by 
rhizoctonia and has the following advantages: (1) mixed matching has an obvious synergistic action, and the preventing and treating effect is enhanced; (2)the function mechanisms of two 
active components in the composition are different, the single selection pressure of 
pathogenic bacteria is lightened, and the composition is beneficial to overcoming the generation of the 
drug resistance of the 
pathogenic bacteria and delaying the generation speed of resistibility; (3) the preventing effect is obviously enhanced after the medicaments are mixed and matched, and the use quantity of the effective components is reduced, thereby the cost is lowered and environmental 
pollution is lightened; and (4) preventing and treating spectra are expanded, the composition also has a treating function to other diseases, and can treat multiple diseases.