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This study investigated molecular mechanism of overexpressing mercury transporter(MerT)from Pseudomonas alcaligenes in Arabidopsis.The ability of the transgenic Arabidopsiss ability to remediate mercury was also investigated.MerT was ectopically expressed in Arabidopsis thaliana. Semi-quantitative RT-PCR was used to analyze expression of antioxidant enzyme genes. Hg concentration was analyzed by flame atomic absorption spectrometry. Histochemical detection of H202 and 02- were conducted by 3,3-diaminobenzidine and nitroblue tetrazoliu-staining methods.