In order to reveal the application effect of machine-transplanting with side-deep fertilization of controlled-release blended fertilizer in the southern double cropping rice. Field experiment was conducted for early- and late-rice,and 4 treatments were set up: no nitrogen (N) fertilizer application,conventional fertilization,machine-transplanting with side-deep fertilization by reducing N of 30% and machine-transplanting with side-deep fertilization of controlled-release blended fertilizer by reducing N of 30%. The objective of this study was to compare the effect of machine-transplanting with side-deep fertilization of controlled-release blended fertilizer and conventional fertilization on yield,economic benefits and nutrient uptake and utilization of double-cropping rice,and its reducing potential. Results showed that the yield and economic benefit of machine-transplanting with side-deep fertilization reduced N by 30% of early-rice is higher than those of conventional fertilization by 20.2%~20.9% and 31.8%~32.4%,and its effective panicle,total spikelet and total grain increased by 6.2%~7.5%,20.5%~25.3%,and 27.6%~28.2%,respectively. The yield and economic benefit of machine-transplanting with side-deep fertilization reduced N by 30% of late rice increased by 3.9%~5.2% and 12.6%~13.8%,and its effective panicle,total spikelet,and total grain increased by 15.8%~17.8%,16.8%~18.6% and 14.0%~16.8%,respectively. Hence,the effect of the reduction of side-deep application of controlled-release blended fertilizer is better. Under the condition of machine-transplanting with side-deep fertilization with a N reduction of 30%,the N,P and K uptakes of early-rice with controlled-release blended fertilizer compare with conventional fertilization reduction at harvest time increased by 1.6%,2.5% and 7.9%,respectively,and those of late rice increased by 4.0%,1.1% and 0.9%,and those of early- and late- rice were increased in N recovery efficiency by 4.2% and 10.2%,in N agronomic efficiency by 3.3% and 1.2%,in N partial factor productivity by 0.6% and 1.2%. In conclusion,in the Dongting Lake area,machine-transplanting with side-deep fertilization of controlled-release blended fertilizer can effectively reduce N fertilizer application in the rice field,facilitate the formation of effective panicle,improve N,P,K accumulation and N fertilizer use efficiency,reduce N loss,and thus realize the production of double-cropping rice in terms of saving fertilizer,saving labor,increasing efficiency and increasing yield.