In order to achieve the high voltage capacitor bank of the electroimpulse deicing system efficiently and safely charging, a series resonant topology pulse power supply based on DSP is researched in this paper. The average charging current of the capacitor bank is concluded by establishing the equivalent circuit of the different working mode, then the operating frequency and resonant parameters are designed, which ensure power supply work in under resonance state, in order to achieve a wide range of constant current charging and zero current soft switching state. Therefore, when the sensor detects the ice of the wing surface, the pulse power supply will work to deicing.