Abstract: The dimension value of the fractural structure would be an important index to quantitatively evaluate the complicated degree of the mine fractural structu re.According to the complicated, and low accuracy of the data statistic method in the evaluation process, on the AutoCAD platform, fractal box dimension, based on the principle and method of the fractal box dimension measurement, the AutoLISP language writing program was applied to realize the automatic statistic function of the fra ctural dimension.A case of Qianyingzi Mine was applied to verify the correction of the program.The results showed that the dimension value calculated with the program was 0.424 51 .590 7 and the related cofficient R of each block section was mostly over 0.95 which could show the correctness and accuracy of the programmed calcula tion.