Abstract: The mass of subsea tunnel and underground engineering suffer from hydrochemical corrosion inevitably. Water-rock interaction is one of the important factors which influence the stability of rock mass. Corrosion tests with different water chemical solutions (HCl,NaOH,NaCl) were carried out in this paper based on the slate of Dalian Metro from the perspective of micro-macro and chemical damage. The pH value,effective porosity and longitudinal wave velocity were measured in the process of soaking. The preliminary discussions were carried on with a series of chemical formula to analyze the slate’s hydrochemistry corrosion mechanism. The deformation characteristics,strength characteristics and fracture morphology of slate under different solutions were comparatively analyzed. Based on the previous experimental formula by experiment between longitudinal wave velocity and hydrochemistry damage,a hydrochemistry damage degree was introduced to carry out a calculation program verification by the independent program of rock elastic-plastic stress-chemical-damage (MCD) more field coupling finite element program. The test results show that:① The slate’s mechanics index include peak intensity (σ_c) and elastic modulus (E),all have different degree of damage influenced by water-rock effect;② The fracture morphology changes from brittle to ductile gradually with the soak time;③ The damage degree and the effective porosity of rock parameters have non-linear relationship between longitudinal wave velocity.