Contradictory effects of Rhizoma Pinelliae have been reported in pregnant mice, rats and rabbits, because the decoction of Rhizoma Pinelliae has obvious embryotoxicity. This paper was obtain an experimental analysis of the frequencies of micronucleus of bone marrow polychromatic erythrocytes (PCE) in mice and sister chromatid exchange (SCE) in cultural lymphocytes of human. The results showed that the decoction of Rhizoma Pinelliae neither induces the occurrencies of micronucleus nor SCE frequencies. Therefore, it may be concluded that the decoction does not have toxicogenetical effects.