The nonlinear electrical properties and aging characteristics against surge stress of ZPCCL-based varistors were investigated for different sintering temperatures of the range $1240-1300^{circ}C$. As the sintering temperature increased, the varistor voltage decreased from 732.2 to 53.8 V/mm, the nonlinear exponent decreased from 58.5 to 4.1, and the leakage current increased from $0.38{mu}A$ to $46.5{mu}A$. The varistors sintered at $1250^{circ}C$ and $1260^{circ}C$ exhibited the high stability against multiple surge, $150A/cm^2(8{ imes}20{mu}s)$. On the whole, the variation rate of electrical characteristics against impulse current stress was gradually increased in order of varistor voltage$ ightarrow$nonlinear exponent$ ightarrow$dissipation facto$ ightarrow$leakage current.