Earrhworms test animats, were exposed in different concentrations of two pesticides: 1-(6 chloro-3-pyridinylmthyl)-N-nitromidazoliding-2-ylideneamin and 2'benzoyi-l'-tert-butylbenzoylhydrazinc. The acute toxicity of thee two pesticides was measured as median lethal concentration values(LC50) of earth worms. Tests of three different exposure systems were performed: the comact filter paper bicossay, the immersion bidets.my and the artificial soil bioassay. The results indicated that the two new type Pesticides showed vaious toxic effects through different exposure paths. The LC50 of 1-(6-chloro-3-pyridinymethyl)-N-nitromidazolidin-2-ytideneamine was 0.034ug