Abstract：The change of rock meso-structure under chemical corrosion is the reason of change of rock mechanical properties，so it is important to study chemical damage effect of rock meso-structure and chemical damage quantitative analysis method. By the analysis of the change of rock meso-structure under chemical corrosion，corrosive and damage effect of chemical solutions on rock meso-structure is studied. Based on the variety of void ratio，computational formulation of chemical damage variable is set up，and the calculation method of damage measurement parameter is put forward. The chemical corrosive damage test in different time segment can continuously be performed on the same sample without destruction when applying this method. So error caused by the difference of rock microstructure of different samples can be avoided.
