In a polar coordinate system, analytical method on field of line is applied to deduce the elastic-plastic exact solutions and the elastic-plastic boundaries of the plastic range(scope of the plastic range) near to stress cracking line of rock mode Ⅱ plane under uniform shear action. On the basis of equilibrium equations and the Mohr-Coulomb yield condition, the elastic-plastic exact solutions satisfy the continuity conditions on the elastic-plastic boundary. Unity in polar coordinates to solve the elastic-p...