In contrast with those Artemisia ordosica which does not been passed through by the cracks caused by underground coal mining in Shendong mining area, Bulianta coal mine, the dynamic evolution characteristics of microorganisms quantity and enzyme activities of soil in the rhizosphere of A. ordosica passed through by the cracks are analyzed by using statistical analytical method. The results show that after the surface cracks appeared, the number of bacteria and actinomyces in the rhizosphere of A. ordosica is reduced, the number of fungi and the activity of enzyme are increased, the amounts of water content and electric conductivity are decreased, therefore the interferences of surface cracks on the biological activity in the rhizosphere of A. ordosica are quite obvious. After more than a year, with surface cracks gradually close, the content of soil water gradually returned to the normal, the effects of surface cracks on phosphatase activity, sucrase activity, and electric conductivity are gradually weakened, while the effect of surface cracks on the number of microorganisms does not change obviously. Nevertheless, the biological activity in the rhizosphere of A. ordosica possesses certain self-repair ability; however the complete recovery of biological activity might take a longer time.