The temperature-dependent energy storage and dielectric properties of Pb0.90La0.04Ba0.04[(Zr0.7Sn0.3)(0.88)Ti-0.12]O-3 were investigated in this work. With the phase transition from antiferroelectric to paraelectric induced by temperature rise, the releasable energy density decreases from 0.74 J/cm(3) (20 degrees C) to 0.29 J/cm(3) (140 degrees C), whereas the discharge efficiency increases from 75.0% to 93.4%. The pulsed discharge current indicates that the stored energy can be released in less than 1 mu s. The temperature has little impact on the amplitude of the current but influences the discharge duration time greatly. In addition, with the comprehensive analysis of hysteresis loops, the DC-bias character of dielectric constant and the discharge current, the transition from strong nonlinearity to linearity of the dielectric along with the phase switching was confirmed. It proves that the vanishment of high-electric-field nonlinear polarization contributions causes the declination of releasable energy with the temperature rise.