Ordered mesoporous carbon was synthesized by liquid impregnation, using polymerized pitch prepared from 1-methylnaphthalene through thermal bromination with dehydrobromination as precursor and mesoporous silica SBA-15 as template. Microstructure and electrochemical properties of mesoporous carbon were characterized. It was found that the optimal preparation conditions were template/pitch mass ratio of 1:1, carbonization temperature of 900 ℃, and heating rate of 1 ℃·min^-1. The optimal sample exhibits highly ordered two-dimensional hexagonal channels, with specific surface area of 675 m²·g^-1, pore volume of 1 cm³·g^-1, and pore diameter concentrated at about 3.84 nm. The Li-S batteries with this mesoporous carbon as the sulfur host showed excellent electrochemical performance. After 300 cycles, the specific discharge capacity and capacity retention were 688 mAh·g^-1 and 67.1% at a current density of 0.2C (1C=1675 mA·g^-1), respectively, while the specific capacity could reach 556 mAh·g^-1 at a current density of 3C.