Abstract: Bearing capacity of coal-pillar was simplified as that of material by neglecting weight and restriction of roof and floor.Cohesion of coal-pillar varied with plastic strain by Gauss function.Coal-pillar damage met Drucker-Prager criterion and its strength parameters were expressed with Mohr-Coulomb criterion.Applying typical elastic and plastic theory，constitutive relationship of coal-pillar was deduced and simplified.Accuracy solution was obtained by numerical integral.Bearing capacity of coal-pillar was simulated with finite element of softening material，simulation result was accordance with solution.Thus，numerical algorithm of coal-pillar＇s bearing capacity was obtained，which could be as test examples of corresponding computer program.