To study the reinforcement effect of rank vegetation on shallow layer of large scale dredged soil storage areas，two kinds of rank vegetation，Pennisetum hydridum and Sorghum bicolor×Sorghum sudanense，are selected and planted in the silty clay-dominated soil storage areas after draining the upper layer of water.The undisturbed pure soil and root-soil composite samples are collected，the reinforcement effect of the roots of the two plants on the soil is quantitatively analyzed through the direct shear test，and the root development and tensile strength of the two plants are observed and compared.The results show that：1) The root of?Pennisetum hydridum?is more denser and the tensile strength is higher，the root content of the soil is 2.1 times，and the root tensile strength is 1.6 times that of?Sorghum bicolor×Sorghum sudanense；2) The internal friction angle，cohesion and shear strength of the soil can be significantly improved by both?Pennisetum hydridum?and?Sorghum bicolor×Sorghum sudanense，and the internal friction angle，cohesion and shear strength of the solidified soil are 1.5~6.3，1.2~2.4 and 1.2~3.2 times that of the pure soil，respectively；3)Under the condition of similar soil moisture content and same horizontal distance from the plant，the soil solidification effect of?Pennisetum hydridum?is better than that of?Sorghum bicolor×Sorghum sudanense；4) The soil solidification effect of?Pennisetum hydridum?obviously weakens with the increase of the horizontal distance from the plant；5)Both the plants can promote the dewatering of the shallow layer of dredged soil.Above all，planting rank vegetation can be taken as an auxiliary measure for soil solidification treatment in large-scale dredged soil storage areas，which is in line with the “carbon peaking and carbon neutrality” goals and the green development concept.