Stylolite is among the most prominent localized inter-granular pressure solution deformation patterns in sedimentary rocks.The complex morphological and fractal characteristics of pressure solution surfaces have been the main focus of many qualitative studies,which in turn lead to more quantitative approaches.In the present paper,the complex morphological characteristics of stylolite in limestone are obtained and numerical samples of limestone with stylolite are generated by digitial image processing technique.Then a suite of compressive tests on the numerical limestone samples with stylolite of various angles are numerically performed to study the influence of stylolite on deformation and strength of limestone with rock failure process analysis code.Meanwhile,the experimental results and numerical simulations are compared and numerical simulations are in good agreement with the experimental results.The study shows that stylolite in limestone significantly degrades the strength of the limestone.The strength of the sample with vertical stylolite is higher than those samples with stylolite of other angles,and its failure pattern is similar to the failure pattern of intact rock sample.The sample with stylolite of nearly 60 degree has the lowest strength and it fails and slides along the inclined stylolite in the rock sample.In addition,obvious localized damage can be observed in the deformation and failure of the rock sample.The findings presented here can further be used to gain an insight into the function of stylolite on mechanical properties and permeability evolution.