Abstract: Mung bean(Phaseolus radiatus)seeds in germination were treated with different hypergravities for different times,and 9g/kg NaCl solution was used to imitate the salt stress on mung beans tested in the experiment.The results show that germination rate and germination index decrease with hypergravity increasing.The roots activity,content of free proline and activity of superoxide dismutase(SOD)of seedlings under 3000×g treatment are significantly higher than those under 2000×g,and the difference between 4000×g and 3000×g is not significant except SOD.The contents of malondialdehyde (MDA)of seedlings of all treatments are lower than that of the control,that of 3000×g treatment is lower significantly than that of 2000×g,those of 4000×g and 3000×g are not different significantly.Under 2000×g and 3000×g hypergravity treatments,the roots activity,the content of free proline and SOD activity of mung bean seedlings increase with the time prolongation.The treatments of 4h and 3h are not different significantly,the content of MDA decreases with the time prolongation.It is concluded that the salt tolerance of mung bean seedlings is improved by hypergravity treatment of 3000×g for 4h.