Abstract: Large superconducting fusion device is used for testing the property of large superconducting magnetic load. When the quench happens in the operating phase, huge energy will be stored inside superconducting load. Therefore, energy inside must be transferred and released immediately by quench protection system. In the quench protection system, the fast discharge resistor system works for the energy absorbing and releasing by heat-dissipating. Due to the transferring energy, duration, power parameters of testing load, the designed system could adjust operating phase by changing structure connections. In addition, the analysis of system design and modular structure design are discussed and the anti-electromagnetic force, structure support simulation are demonstrated by FEA software, thus the feasibility of fast discharge resistor system can be verified.