One Marx generator for triggering switch of pulse power system is developed. The basic principle and main parameters are specified. The coaxial structure and resistor type design are adopted. The output parameters of generator on matched load, 75 Ω, are higher than 200 kV voltage amplitude, more than 90ns pulse width, single to 10 Hz repetition operation, less than 10 ns rising time, less than 20.1 ns time jitter.