Abstract: Uniaxial compression tests,triaxial compression tests and splitting tests were conducted on the granite speci- mens after the erosion of chemical solutions with different pH values and different flow rates. The responses of strength damage,deformation behavior and mechanical parameters of granite in water and different acidic solutions were com- pared and analyzed. It shows that uniaxial and triaxial compressive strength,tensile strength,Young’ s modulus,and cohesion of granite decrease with the reduction of pH value or the increase of flow rate of acidic solutions,while Pois- son’s ratio is quite in reverse. The internal friction angle of granite after soaking in acidic solutions is smaller than granite in natural dry state,but there is no obvious change in comparison to granite soaking in water. Also,the com- pressive deformation of granite transforms from brittleness to ductility after soaking in acidic solutions. In conclusion, the pH value and flow rate of natural hydro-chemical environment are two factors that significantly change the strength damage,deformation behavior and mechanical parameters of rock. However,the pH value of acidic solution has a grea- ter impact than the flow rate.