This research investigates the effective input parameters of the Elliptical Cross-Section Spiral Equal-Channel Angular Extrusion (ECSEE) method and selects the optimal performance. The influential parameters in the ECSEE method are considered as input factors in the experimental design, which are expressed in three parameters: punch speed, sample annealing, and the number of extrusion passes. Subsequently, a Taguchi design of experiments (DOE) table was created for each input parameter according to its variation range. After designing the experiments, the output results of forming force and plastic strain for each level were obtained using experimental tests. The optimization of the input values was investigated based on the S/N ratio criterion ("the smaller the better" for forming force and "the larger the better" for plastic strain). The obtained results indicated that the optimal test level in the ECSEE method for achieving the minimum forming force is using a punch speed of 6 or 9 mm/min, sample annealing at 300°C for 120 minutes, and 2 extrusion passes. Furthermore, to achieve the maximum plastic strain, the optimal parameters are a punch speed of 9 mm/min, sample annealing at 200°C for 120 minutes, and 6 extrusion passes.