The densification behavior and electrical conductivity of $Ce_{0.8}Gd_{0.2}O_{1.9}$ ceramics were investigated with the strontium gallate concentration ranging from 0 to $5;mol\%$. Both the sintered density and grain size were found to increase rapidly up to $0.5;mol\%$ $Sr_2Ga_2O_5$, and then to decrease with further addition. Dense $Ce_{0.8}Gd_{0.2}O_{1.9}$ ceramics with $97\%$ of the theoretical density could be obtained for $0.5;mol\%$ $Sr_2Ga_2O_5$-added specimen sintered at $1250^{circ}C$ for 5 h, whereas pure $Ce_{0.8}Gd_{0.2}O_{1.9}$ ceramics needed to be sintered at $1550^{circ}C$ in order to obtain an equivalent theoretical density, Electrical conductivity was measured as a function of dopant content, over the temperature range of $350;-;600^{circ}C$ in air. Total conductivity of $0.5;mol\%$ $Sr_2Ga_2O_5$-added specimen showed the maximum conductivity of $2.37{ imes}10^{-2}{{Omega}-1}{cdot}cm^{-1}$ at $500^{circ}C$, The addition of strontium gallate was found to promote the sintering properties and electrical conductivities of $Gd_2O_3$-doped $CeO_2$.