This paper provides a method of random generation of soil-rock mixture using digital imaging technology and rock form database technology. By MATLAB program

the boundary extraction

boundary smoothness and regularization to rock images can be obtained. After those process

the coordinate of block nodes and shape parameters needed for database construction can be extracted. The database of rock shape can be built with massive of rock samples coordinate and shape parameters. Under some constraint conditions

the data of specific rock samples could be selected from the database. After rotation and zooming

by the random distribution rule

the rock samples can be placed in a 2D space of specific shape. These are the circulation processes of model establishment. When the block proportion reached the setting limit

the soil-rock mixture model establishing finished. As to import the model into ABAQUS

a program using PYTHON language was used to realize the process. This random distribution method can take many parameters such as particle diameter

shape parameters and block proportion in consideration. It also avoids the fiction of rock shape in general soil-rock mixture random distribution and the difficulty of model data acquisition with digital imaging technology. This method provides a good way to study the general law of soil-rock mixture physical and mechanical properties.