Results of the effect of Phosphamidon on soil, root-and leaf-surface fungi of Vigna sinens& var. azmerly were generally inconsistent. However, there were some consistent ones. Its effect on soil, root-and leaf-surface fungi persisted till after 40 days. In soil the total count was regularly increased after 20 days by the low and medium doses and after 40 days by the high dose. In the rhizosphere, Fusarium was almost consistently activated by the three doses after 5 days of treatment and by the low dose after 20 days. In the rhizoplane, the total count of fungi was lowered by the three doses after 40 days in the two sowings. Alternaria alternata was toxicated by the three doses after several experimental periods of the two sowings in the phyllosphere and phylloplane. When this insecticide was incorporated with the agar medium, it was of no significant effect on the total count of fungi at the low and medium doses but abnormally increased the total count at the high dose. In the liquid medium, the mycelia of the test fungi were not significantly affected except that of Penicillium eorylophilum which was significantly retarded by the three doses and Rhizopus stolonifer which was significantly activated by the high dose.