The varistor properties of ZPCCL-based ceramics were investigated at different $La_2O_3$ contents in the range of $0{sim}2.0$ mol%. As $La_2O_3$ content increased, the ceramic density greatly increased in the range of $4.71{sim}5.77;g/cm^3$ and the varistor voltage greatly decreased in the range of $503.5{sim}9.4$ V. The varistor with 0.5 mol% $La_2O_3$ exhibited good nonlinearity, in which the nonlinear exponent is 81.6 and the leakage current is 0.2 ${mu}A$. Furthermore, the varistors exhibited the high electrical stability, with $%{Delta}V_{1mA}=-1.1%,%{Delta}{alpha}=-3.7%$, and $%{Delta}I_L=+100%$ for DC accelerated aging stress condition of 0.95 $V_{1mA}/150^{circ}C/24$ h.