elenium is not an essential element for plants,but optimal Se can stimulate growth of plants.In this paper,the effects of different concentration of Se(0~5 mg/kg)on the Se content,grain yield,chlorophyll content,photosynthesis,antioxidation and cell permeability in rice were studied in pot experiment to clarify the impact of Se on rice growth.Result showed that 1.0 and 5.0 mg/kg Se treatment significantly increased the grain yield by 20.8% and 28.8%.The application of Se increased the Se concentration in husks,rices,staws and roots of rice plants.chlorophyll a and chlorophyll b contents were unaffected by Se application,however,the content of carotenoids was significantly increased in 5.0 mg/kg Se treatment.The application of Se increased the intercellular CO2 concentration,the transpiration efficiency and the photosynthesis rate of rice,the highest value were increased by 28.4%,26.1% and 25.0%,respectively.Se treatment significantly decreased the electrolyte leakage and relative conductivity of rice.The application of Se significantly increased the activities of superoxide dismutase,peroxidase and catalase of rice,the highest values were increased by 101.2%,23.4% and 64.3%,respectively.This study indicated that selenium promoted the growth of rice by enhancing photosynthesis and antioxidation.