This paper described the structure parameters and working principle of the spiral generator, and analyzed the influence output characteristics of spiral generator’s three loss factors: switch resistance loss factor, spiral generator resistance loss factor and transmission line between adjacent coaxial capacitor leakage loss factors. Spiral generator’s loss factors were determined by structural parameters, through experiment and research, the paper gave the structural parameters of spiral generator as output effect relation, and the transmission loss factor and the adjacent resistance electric leakage coaxial transmission loss factor and the structural parameters of the empirical formula. It provides experimental data for constructing circuit model of spiral generator and technical refere