Flooded sediments provide important material for studying the scale and law of ancient flood disaster events in the middle-lower reaches of the Yangtze River. Through systematical sampling, measuring and calculating the sediments of the dam break, occurring in Paizhouwan of Hubei Province in Aug. 1, 1998, identification marks of magnetic fabric characteristics of the modern dam-break flooded sediments in the middle reaches of the Yangtze River are established and discussed in this paper. The magnetic fabric characteristics of the dam-break fan sediments are as follows. From the foot to the edge of the dam-break fan, the statistical average values of the magnetic fabric parameters (anisotropy degree of magnetic susceptibility P, magnetic facet F, magnetic lineation L and velocity of water flow Fs) all change from large to small. The statistical directions to the principal axis of the magnetic susceptibility magnitude ellipsoid in different positions of the dam-break fan have different features, that is, the statistical direction changes greatly at the foot and the edge of dam-break fan. Especially, at the edge of the dam-break fan the direction of the maximum susceptibility principal axis is at random with no obvious main direction. But it is relatively stable in the middle of the fan. And the optimum direction of the maximum axis is very clear.