The Li₂MoO₄ powder was synthesized and its crystal was grown at room temperature by the aqueous solution method, respectively. Compared with the common high-temperature sintering, this method effectively improved the uniformity and purity of the powder. The Li₂MoO₄ ingot has a regular shape with a size of 20 mm×30 mm×40 mm. The crystal grows regularly in the crystal-face directions and its main crystal planes are (100) and (110) planes. The morphology of Li₂MoO₄ was observed by a metallographic microscope and the crystal was of step-like growth. The cutoff wavelength on the absorption edge of the crystal is about 292 nm. At room temperature, the wavelengths of excitation and emission peaks are 370 nm and 445 nm respectively, while they shift to 275 nm and 520 nm respectively at low temperatures (10 K). As the temperature decreases, the wavelength of the emission peak has a redshift and the emission intensity increases sharply.