Abstract: This article reports the test of heat-tolerance of Fonsecaea pedrosoi,Fonsecaea.compactum,Phialopbore yerrucosa,Wangiella de;matitidis and Cladosporium,ca;rionii.0ur findings show that one of the five strains(Wangiella dermatitidis) has the peculiarity of heat-tolerance and can grow confinually at 45±11℃ for ten days,while the other four strains are inhibited,but not killed,The suspension of these strains are heated at 90℃ for ten minutes and are boiled under normal atmospheric pressure for five minutes,the growing eoIonies of them are treated withsteam under the pressure of eight pounds for five minutes and they are all eradicated.This finding is of some significance in guiding to determination of the species of these fungi and also for prevention and treatment of chromomycosis.