The purpose of this study is to establish a method for determining mercury(Hg)content in plant samples using a DMA-80 direct mercury analyzer.The standard curves of three different mercury concentration series are configured，including Hg concentrations ranges of 0 ～ 2，0 ～ 15 and 25 ～ 1023 ng.The results showed that the signal value of the instrument had a good linear relationship with the total amount of Hg in the standard curves.There lative standard deviation of measured values of each plant sample with 6 replicates was less than 7%.According to the weighed sample volume of 0.1 g，the detection limit of the proposed method was 0.169 ng/g based on the results of measurements of blank data.The recovery rate was in ranges of 99.3% ～ 102.2% when adding the standard Hg solution to the plant samples.Two national standard reference materials such as samples of rice flour and citrus leaves were selected for testing.Each sample was measured with 6 replicates.The measured value was consistent with the reference value of the standard reference materials with relative standard deviation less than 7.0%. It is suggested that DMA-80 direct mercury analyzer could be used for determining Hg concentration in plant samples.The proposed method saves time and is suitable for the fast and efficient measurement of batch plant samples.