Potential antimutagenic activities of vegetable plants were investigated. 24 vegetables which are frequently consumed by Korean people were extracted with 70% ethyl alcohol to prepare the extract samples. Then those samples were added to the culture media containing mitomycin C($O.3;{mu}g/ml$) and the SOS-Chromotest was performed. Positive control, mitomycin C alone, showed about 330 units of ${eta}$-galactosidase activities. Among 24 vegetable samples, Saxifraga oblougifolia Nakai (취나물, Saxifragaceae) and Platycodon grandiflorum A. De Candolle(도라지, Campanulaceae) showed 136 and 155 units, respectively when mitomycin C was treated. These results indicate that Saxifragae Herba and Platycodi Radix possess protecting action from mutagenic activity produced by mitomycin C.