Sulfur is able to react with Li in reversible reaction to form Li2S in the lithium sulfur battery configuration. The theoretical capacity of lithium sulfur battery is about 1672 mAh/g which is higher than the capacity of conventional Li-ion batteries. However, there are some problems should be overcome for the utilization of sulfur cathodes. It is common to use of carbon as the matrix to host sulfur cathodes and increase the conductivity. Previously, numerous carbons with specific morphology and porosity have been used. The presence of porous structures is believed can be able to facilitate the homogeneous infiltration of sulfur on the carbon pore structures and improves the connectivity between carbon and sulfur components. Generally, the synthesis process of carbon materials is very complex that cause the large scale production is expensive and difficult. Here, porous carbon was synthesized from biomass waste spent tea leaves by hydrothermal carbonization and ZnCl2 activation process. Hierarchical porous carbon with high surface area (1875 m2/g) and pore volume (1.15 cm3/g) was obtained at ZnCl2/carbon ratio 0f 4.0 and activation temperature of 800 C. As-obtained porous carbons were then utilized as as composite sulfur cathodes for Lithium Sulfur battery. The porous structure permits sulfur loading of 59.5 wt% to be diffused into the carbon host. The carbon-sulfur composite electrodes exhibited the electrochemical performance by showing an initial specific capacity of 1048 mAhg-1 at 0.05 C and maintained specific capacity of 627 mAhg-1 after 100 cycles. Furthermore it had good capacity retention of 428 mAhg-1 at 0.5 C even after 100 cycles, which reveals its promising roles as sulfur cathodes in lithium sulfur batteries.