The modifier and water management measures for soil aggregate stability in soil of the cold water logged paddy field were studied to provide scientific basis for screening soil structure modifier.Two types of soil including cold spring and cold mud for cold water logged paddy field in Yangxin county and Xianning county in Hubei Province were used.Under treatment of long-term flooded and dry-wet alternate,model culturing experiments of six treatments including dolomite fines,biochar,fly ash,polyacrylamide,and blending modifier adding or not adding compound amendment in two types of soil separately were conducted.The distribution of aggregate and water stability of soil at the 30th,90th,180th,and 360th day after culturing were measured.The results showed that under dry-wet alternate condition,different modifier promoted the formation of soil aggregate in cold spring and cold mud for cold waterlogged paddy field,and increased with the extension of incubation time.It was basically stable at the 180th day.Under long-term flooded,modifier promoted aggregate formation in the short term.The aggregate was unstable.For different modifier,fly ash and blending modifier by fly ash+polyarcylamide+biochar were better for the formation of big aggregate in cold spring and cold mud waterlogged paddy field.