Abstract: Laboratory tests were conducted to study the mechanical behaviors of Jinping marble during triaxial compression process. From the perspective of micromechanics, the genesis of its mechanical characteristics is discussed. On this basis, by introducing two factors, the modified CWFS model was established, which could reflect the cohesion weakening and friction strengthening characteristics of marble during the stress-strain process. Subsequently, the modified CWFS model was validated by test results. The results showed that: ① with the increase of confining pressure, obvious post-peak brittle-ductile-plastic transition of Jinping marble was demonstrated, the difference between peak strength and residual strength decreased monotonously, and the slopes of stress-strain curves become gentle from peak strength falling to residual strength;② under high confining pressures, the friction between rock fractures and the inside homogenization degree of rock were the main causes leading to post-peak brittle-ductile-plastic transition of marble;③ the modified CWFS model could reasonably describe the strength and deformation characteristics of marble during the whole stress-strain process, and the physical meanings of model parameters are explicit and were easy to be obtained.