Abstract: By changing discharge type of electric coagulation reactor coagulation zone, a new bipolarly charged method of particles in pulsed electric field was proposed. This method was compared with that dust collection efficiency in alternating electric field, the comparison shows that when the dust collection region board average field strength is 5kV/cm and coagulation zone pulsed voltage peak value is 10kV, the dust collection efficiency of bipolar charged particles in pulsed electric field will reach to 97% and be higher 1% than that in AC electric field.