The Large-scale Superconductor Test Facility (LSTF) serves as an important part of superconducting magnet load testing for fusion research which concerns about the nuclear energy producing. During the testing process, quench protection (QP) is indispensable for protecting the load from being overheated damaged. In this paper, a compatible and flexible QP framework is put forward to meet the different QP requirements including transferring time, protection voltage, the temperature raise, current decay speed and so on. The QP framework can provide the solution of changing the power units parameter on account of specific testing superconducting magnet. Firstly, the LSTF is introduced and the QP process in the system is comprehensively analyzed by discussing the power units’ actions and circuits currents’ flowing. Then the power units of QP system are studied by elaborating the power parameters adjustments in corresponding to different loads, especially the counter-pulse capacitor unit and the fast discharge resistor system. Finally, the testing process of central solenoid coil used for the China Fusion Engineering Test Reactor is described to illustrate the operation of the QP framework.