The 103 samples of C offea robusta were investigated, 507 fungi trains were isolated on Czapek or PDA media for identification. 52 species from 9 genera were listed. The genus Aspergillus with 25 species and Penicilium with 13 species represented respectively 43 percent and 23 percent of the total number of species. The Ochraceus group, well-known as OTA potential producers with 6 species represented 9 percent of the total number of isolates. By direct plating, the beans with the moisture of 11-14 percent, were heavily contained by moulds (80 to 100 percent of the beans plated) and those with the moisture of 9-10.5 percent were lightly infected (10.3 percent). 22 species (40 percent) were known as producers of different mycotoxins. 0TA were present on 50 of the 52 samples examined (96.4 percent), but the level was not high: 88.5 percent with less than 1 ppb/kg. The authors proposed that Vietnamese C. robusta green beans for exportation would have less than 11 percent moisture to prevent mould growth and in a humid tropical climate of Vietnam, to prevent dehumidification, the beans would be packed in two-coated bag, the inside coat in polyethylene sheet of 0.08 mm thick and the external one in jute as ordinary. The beans thus would be prevented from dehumidification and mould formation for at least 5 to 6 months.