The pulse power supply for X-band Traveling-Wave Tube(TWT) experiment was developed. It consisted of anode control power supply，slow-wave line power supply，collector power supply，auxiliary power supply and control system. Since the output pulse width of the anode control power supply had varied greatly，the series-connected Insulated Gate Bipolar Transistors(IGBT) switch was applied to anode control power supply. The experiment results indicated that the power supply system could meet the requirements of the X-band TWT experiment，and the pulse voltage with continuously adjustable pulse width from 4 μs to 3 000 μs had been obtained on the anode of the X-band TWT.