In order to reveal the effectiveness of Polygonum cuspidatum resveratrol synthase（PcRS） gene in improving the resveratrol accumulation in foreign species,first,the plant expression vector pCAM1380-35S-PcRS was constructed and introduced into Arabidopsis thaliana by Agrobacterium tumefaciens by means of the floral dip me-thod.Next,the transformants were screened on the medium containing hygromycin.Then,the integration of PcRS gene into the transgenic plants was verified via the PCR and the Southern blotting.Moreover,independent homozygous transgenic Arabidopsis thaliana lines with genetical stability were obtained after the selection of T3 progenies,and the expression of the gene transferred into Arabidopsis thaliana was confirmed by Northern blotting.Finally,an end product,namely trans-piceid,was identified by HPLC,the content of which in 2-week-old plants being 136 μg/g（fresh weight） or 1 813 μg/g（dry weight）.