Abstract: Based on the Mohr-Coulomb failure criterion, this paper proposes a calculation method of the ultimate bearing capacity for the beam end concrete under the constraint of prestressed reinforcement, by which the theoretical value of the ultimate bearing capacity is obtained. The result is compared with that obtained by the finite element software ABAQUS. It is shown that the theoretical formula derived based on the failure criterion of Mohr-Coulomb gives a result consistent with the numerical one, which verifies the correctness of the theoretical formula. The theoretical formula shows that the prestress can improve the stress state of the beam end concrete, and the ultimate bearing capacity of the beam end.