The electrical and dielectric properties of $ZnO-Pr_6O_{11}CoO-Cr_2O_3La_2O_3-based$ nonlinear resistors were investigated at different sintering temperatures in the range of $1230{sim}1300^{|circ}C$. As the sintering temperature increased, the breakdown voltage decreased from 777.9 to 108.0V/mm, the nonlinear coefficient greatly decreased from 77.0 to 7.1, and the leakage current increased from $0.4{mu}A;to;50.6{mu}A$. On the other hand, the donor density from $0.90{ imes}10^{18};to;2.59{ imes}10^{18}/cm^3$ and the barrier height decreased from 1.89 to 0.69 eV with increasing temperature. The dielectric dissipation factor increased from 0.0879 to 0.2839 for the increase of sintering temperature.