The excitation regulator of synchronous impulse generator using CompactRIO and LabVIEW based on graph language had been developed. The excitation regulator including host computer and embedded realtime hardware was able to control and supervise the working conditions and parameters of voltage and current in very one millisecond during a pulse of discharging. The digital incremental PID control algorithm was utilizing in the regulator to be control of voltage pulse precisely. Requirements of impulse generator’s excitation in adjustment of excitation waveform and operating model of periodical starting and ending were meet.