The changes of development and photosynthetic rate of mung beans seedling under 1 μmol/L Cd stressand accumulation of Zn, Fe, Mn, Cu were determined in the test. Results showed that under Cd stress, the plantheight, root length, root numbers and biomass decreased, leaf photosynthetic rate and the accumulation of Zn, Fe,Mn, Cu in stem and leaves were also decreased, while Zn, Fe and Cu concentration in roots increased. This indicat-ed that Cd stress influenced plant development and photosynthesis through the changes of accumulation of micronu-trient in plant.