The simulation model of varistors and simulation circuit of CWG（combination wave generator） are set up for studying the influences of capacitor coupling and varistor coupling modes on short current waveform parameters of CWG

and the simulation results are achieved.The coupling capacitors make the front time and half peak time of short current wave decrease

and virtual impedance increases.With the coupling capacitance increasing

the front time and half peak time of short current wave increase

and virtual impedance decreases.The coupling varistors have the same influence law as the coupling capacitors.For the same kind of varistors

the front time and half peak time of short current wave decrease

and virtual impedance increases with the storage capacitor charge voltage.But at the same storage capacitor charge voltage

the front time and half peak time of short current wave decrease

and virtual impedance increases remarkably with the U1mA on varistor increasing.