Abstract: Based on collecting and analyzing kinds of domestic and abroad model sands characteristics, a new type of model sand made of hydrophilic resin was developed in order to reach similar conditions of the Changjiang River flood control model's research. In this research, the basic physical and
resistant characteristic parameters are tested, such as the density, the angle of repose, the start and the settlement for this sand, etc. On the basis of above study results a local reach's movable-bed hydraulic model experiment was carried out for the sand. The experimental results are as follow
s: It can meet Changjiang River flood control model requirements of similarity, such as the sand's settlement and initiation motions, etc.; The type of model sand physical nature is stable, and, it can be regulated and produced in mass; The roughness of the bed varies from 0.013 to 0.021, gradually increasing as the sand ripple's development.