The gleyed paddy soil is a main kind of low yield paddy soil in south China,which affects the rice yield greatly.A field experiment was carried out to discover the improvement effect of the combined application of organic and inorganic fertilizers on the soil total amounts of reducing substances and rice growth traits under ditch drainage condition.The results showed that combined application of organic and inorganic fertilizers could improve the tiller number in early and late rice.The tiller number per plant of the treatments combined application of organic and inorganic fertilizers was increased by 38.1%~56.8% compared to CK at 42 days after transplanting in early rice,and 27.9%~37.3% to NPK.The tiller per plant in combination of organic and inorganic fertilizers was increased by 8.5%~14.6% compared to CK and 7.7%~13.7% to NPK in 96 days after transplanting in late rice.However,there was no significant difference among 3 kinds of organic fertilizers.The grain yield of rice in combination of organic and inorganic fertilizers increased 29.6%~45.9% compared to CK,and 10.0%~23.7% to NPK.Moreover,the treatment of combined application of green manure and N,P,K fertilizers in early rice and combined application of pig manure and N,P,K fertilizers in late rice got the highest grain yield in all the treatments.Under the engineering measures of ditch drainage,the soil total amounts of reducing substances of the treatment combined application of green manure and N,P,K fertilizers was reduced by 23.1%~32.5% compared to CK,and reduced by 15.0%~25.3% to NPK in early rice.In late rice,the soil total amounts of reducing substances of the treatment combined application of pig manure and N,P,K fertilizers was reduced by 32.5%~37.5% compared to CK.The results suggested that combined application of organic and inorganic fertilizers under the engineering measures of ditch drainage could improve the grain yield of rice and reduce the soil total amounts of reducing substances in gleyed paddy soil in Poyang lake region.