The evolution of dynamic hysteresis of lead zirconate titanate stannate antiferroelectric bulk ceramics at various frequencies (f) and field amplitudes (E-0) has been investigated systematically. A series of asymmetrical minor loops were observed when the working fields were slightly lower than the forward switching field E-AF. As E-0 increased above E-AF, symmetrical double loops appeared and their energy densities w against f and E-0 were found to be fit the scaling behavior as w alpha f(-0.02) (E-0 - E-c)0.08, where E-c representing the threshold field is designated as E-AF. The study is helpful to application of antiferroelectrics as energy-storage capacitors.