Abstract: By applying 3 winter wheat cultivars of different water-resistance,the effect of waterlogging at booting stage on the growth and development of root system, ³²P absorption and its distribution,and senescence of root system was studied with soil column culture.Waterlogging at booting stage reduced root dry weight,its activity and SOD activity,and increased the relative permeability of plasma membrane and the membrane-lipid preoxidation level(MDA content)of root system.Meanwhile,waterlogging influenced the ³²P absorption,transportation and distribution,and consequently,speeded up the senescence of root system.