10 mol% $Gd_{2}O_{3}-CeO_{2}$ powder was sintered by microwave in a 2.45 GHz multimode cavity to develop a dense electrolyte layer for intermediate temperature solid oxide fuel cells (IT-SOFCs). Samples were sintered from $1100^{circ}C$ upto $1500^{circ}C$ by $50^{circ}C$ difference and kept for 10 min and 30 min at the maximum temperature respectively. Theoretical density of the sample sintered at $1200^{circ}C$ for 10 min was 95.4% and increased gradually upto 99% in the sample sintered at $1500^{circ}C$ for 30 min. All of sintered samples showed very fine microstructures and the maximum average grain size of the sintered sample at $1500^{circ}C$ for 30 min was $(0.87{pm}0.42){mu}m$. Ionic conductvity of the samples were measured by DC 4 probe method.