In present paper the effect of chromium(Cr6 ) on rice seed germination and seedling growth were studied.It was showed that Cr6 was harmful to germination and growth of rice.With increase of Cr6 concentrations,the seedling height,root length,fresh weight and dry weight decreased,the rice seedling growth was inhibited distinctly,but the outset density of chromium harmful to paddy plants in hydro-culture experiments was lower than that in pot-culture experiments,with more serious chlorosis symptoms.