Abstract:A new meso-mechanical testing system is developed to carry out the experiment of microfracturing process of rocks under the coupled mechanical-hydrological-chemical environment. The image of microfracturing process of the specimen under triaxial or uniaxial compression can be observed and recorded digitally. The loading system is servo-controlled. The microfracturing process of limestone specimen under uniaxial compression with the coupled mechanical-hydrological-chemical environment is recorded by using the testing system. As an example,the results of the specimen soaked in chemical solution of NaCl of 0.01 mol/L and pH = 7 are analyzed. The cracking velocity of cracks at length and width directions is also calculated. The results are compared with those of the specimens without chemical corrosion. The comparison indicates that the testing system is applicable and chemical corrosion can reduce strength of rock and accelerate cracking of cracks.