Abstract: The Yangtze River becomes wide after it runs through the Nanjinguan Pass of theThree Gorges, then the hydraulic gradient decreases. The grains of the sediments gradually thindown from the upper reaches to the lower reaches, hence the engineering geological condition becomes bad gradually from the upper to the lower reaches of the river. With expecting to provide data of physical properties, engineering geomechanical characteristics, and basic geologic environment of the floodplain land in the modern beach of the middle and the lower reaches of the river.