The changes of soil basic productivity of winter wheat farmland under conventional fertilization on fluvoaquic soil area were researched,which could provide a scientific basis for enhancing farmland potential productivity and the sustainable use of the arable land resources in the region.Based on the monitoring data of the 29 national cultivated sites on fluvoaquic soil area from 1988 to 2006,the basic soil productivity index(BSPI)model of winter wheat was built to analyze the changes of basic soil productivity of winter wheat under conventional fertilization on fluvoaquic soil area.After the 19 years of fertilization,BSPI of winter wheat had a significant rising trend and increased by 385% compared with that in the first 3 years.The annual increase rate was 20%.The changes of BSPI were different under low,medium and high soil fertility farmland.BSPI increased significantly with 32% annual increase rate under low soil fertility farmland,but increased slightly under medium and high soil fertility farmland.BSPI in different provinces also had significant difference.BSPI was the highest in Jiangsu province and lowest in Anhui province.The order of BSPI of winter wheat among provinces was Jiangsu>Beijing>Henan>Shandong≈Hubei(0430)>Hebei>Shanxi>Anhui.Longterm conventional fertilization(manure or straw combined application with chemical fertilizers)significantly enhanced the basic soil productivity of low soil fertility farmland.For medium and high soil fertility farmland,longterm conventional fertilization stabilized basic soil productivity which is important for crop yield increase.