The effects of condensed molasses soluble (CMS) on seed germination and seedling growth of rice were analyzed by seed germination and hydroponic culture experiments at seedling stage. Results showed that different concentrations of CMS had no significant effect on rice germination rate. But when the concentration of CMS exceeded 0.15 g/L,it inhibited rice growth. Results of hydroponics experiments at the seedling stage of rice showed that excessive CMS applied on the basis of normal nutrition significantly increased the root diameter,decreased root length and volume,inhibited the accumulation of phosphorus in root and shoot,and dramatically increased POD,CAT activity and MDA content roots of rice. Results of pot culture experiments showed that when 10 g per pot CMS was applied on the basis of half normal fertilization,the yield per plant of rice increased by 143% and 44% respectively compared with that of non-fertilizer and 1/2 normal fertilization only. However,the application of CMS on the basis of normal fertilization had no effect on rice yield. It is indicated that a certain amount of CMS can increase rice yield under deficient nutrient conditions,but cannot increase rice yield under sufficient nutrition conditions.