Based on the experimental research on the shear test behavior of two general beams and two overhanging RC beams strengthened with PVA-ECC, the regulations for the change of the mode of diagonal cracks, failure, deflection and strain have been analyzed in the experiment. The results show that this reinforced method can increase the crack-resisiting capacity and impove the shear stiffness and the load-bearing capacity of the beam. According to the test results, the computational formula of the shear load capacity of overhanging RC beams strengthened with PVA-ECC was established. The calculated results fit well with the experimental results, thus providing a theoretical reference for practical engineering designs.