Abstract: To improve the axial deformation capacity and the post-earthquake repair efficiency of the self-centering brace, DP-SCEB (a self-centering energy dissipation brace with series device of disc spring and prestressed tendon) is proposed. DP-SCEB uses the series device of disc springs and of prestressed tendons as the self-centering system to obtain a high axial deformation capacity, and it can be rapidly repaired through the external placement of energy-dissipating components. This study first presents the structural configuration and working mechanism of DP-SCEB. Subsequently, two quasi-static tests were conducted on the same DP-SCEB test specimen by replacing the damaged energy dissipating component. The mechanical behavior of the DP-SCEB before and after damage repair were studied, including damage distribution, failure mode, deformation capacity, energy dissipation capacity and self-centering capacity. The test results demonstrated that the hysteresis curves of DP-SCEB exhibited an ideal flag-shaped characteristic. After the first quasi-static loading test, a rapid damage repair was achieved by replacing the core energy-dissipating plate in DP-SCEB. Post-repair, the hysteresis curve showed nearly identical to the initial one, which achieve the intended objectives of damage recovery. Moreover, the failure mode of DP-SCEB was the ideal fatigue fracture of the core energy-dissipating plate, which led to a degradation in load-bearing capacity, while all other components remained elastic throughout the testing process. And a favorable axial elongation of 2.0% for DP-SCEB was reached, when the core energy-dissipating plate experienced fatigue failure.