Lithium garnet-type oxides Li7-2xLa3Zr2-xMoxO12 (x=0, 0.1, 0.2, 0.3) ceramics were prepared by a sol-gel method. The influence of molybdenum on the structure, microstructure and conductivity of Li7La3Zr2O12 were investigated by X-ray diffraction, scanning electron microscopy, and impedance spectroscopy. The cubic phase Li7La3Zr2O12 has been stabilized by partial substitution of Mo for Zr at low temperature. The introduction of Mo (x0.1) can accelerate densification. Li6.6La3Zr1.8Mo0.2O12 sintered at lower temperature 1100 degrees C for 3hours exhibits highest total ionic conductivity of 5.09x10(-4)S/cm. Results indicate that the Mo doping LLZO synthesized by sol-gel method effectively lowers its sintering temperature and improves the ionic conductivity.