Abstract：The evolution law of the crack generation-extension-connection-failure in the surrounding rocks of roadway caused by mining is investigated in the paper by using similar simulation and fractal geometry theory. Cracks in the two roadway walls are extending to the depth in arc shape and diminish in a power function law. Cracks at the top of the two sides abide by the conic evolution law. The cracks of the roadway top mostly concentrate at the top of the roadway walls. The crack distribution and evolution of the surrounding rocks of roadway can be quantitatively depicted by the fractal dimension of crack density. The research results are useful for understanding the occurrence and development law inside the surrounding rocks，and applied as the basis of selection of bolting scheme of roadway and optimization of bolting parameters.
