Abstract: A variable pulse generation and radiation system working at high-power very high frequency(VHF) band was investigated. Based on optimization, radiation output with pulse width between several nanoseconds and tens of nanoseconds was obtained under laboratory conditions. To realize the adjustability of the pulse width, the open-circuit capacitive antenna was loaded with a variable inductor. By introducing the large inductor in parallel, little pulse tail and high efficiency are also achieved. Besides, high-power and short-pulsed source was applied in discharge circuit for energy storage and discharge, which reduced the synchronization jitter between the radiation pulses.