The mechanism of stone exfoliation and its cause in relation to chemical weathering by soluble salt werestudied. Chemical, mineralogical and physical analysis was performed in exfoliation samples from stone monuments.The representative salt is gypsum in the exfoliation samples. In order to understand the salt reaction, stonesolubility. The capillary water uptakes are slight increased in impregnated with Na2SO4 and weathering simulation oftwo rock types. It means that the rock is deteriorated in the near of the surface by Na2SO4. CaSO42H2O bring out thethicker exfoliation than Na2SO4 because it is penetrated into the deeper zone and amount of accumulated salt is more30cycle of weathering simulation, but there are not significant symptoms of exfoliation in the granite by same condi-tion. This result was caused by the different capillary water uptakes and porosity of the rocks. In the tuff, salt solu-tions are penetrated into the inner part due to its high capillary water uptakes and porosity but the granite, which haslow value relatively, can be formed thinner exfoliation.