A continuous seven years of field experiment was conducted on purple claybased paddy soil to study rice yield and characteristics of nitrogen and phosphorus in rice plant under condition of different amounts of organic fertilizers and chemical fertilizer reduction application.Meanwhile,the factors affecting nitrogen and phosphorus use efficiencies in rice plant were analyzed.The results showed treatments with organic fertilizer application increased rice yield in various degrees compared with treatment with chemical fertilizer use only,of which treatment with 30 t·hm-2 organic fertilizer and 1/2 chemical fertilizer application had the highest rice yield,which was 567% higher than treatment with chemical fertilizer use only.When organic fertilizer application rate reached 60 t·hm-2,rice yield was 556% higher than that of chemical fertilizer use only,but accumulated highest nitrogen and phosphorus in aboveground part of rice in all treatments,especially for nitrogen with 16.5%~25.4% higher than other treatments.There were no significant differences in nitrogen and phosphorus translocation amounts and physiological use efficiencies between the treatments with organic fertilizer and chemical fertilizer use together and the treatment with chemical fertilizer use only.When organic fertilizer application rate reached 60 t·hm-2,nitrogen translocation was raised obviously,but nitrogen physiological use efficiency was reduced significantly.Phosphorus in rice showed the same performance,although,less obvious than nitrogen.The reasons were soil nutrient contents increased very significantly with huge application of organic fertilizer,which probably were too much for rice to use.and ammonium nitrogen content in soil was too high during rice growth stage.