The study showed that vetiver plant can be used as a raw material for biogas production. The highest biogas yield, daily biogas yield and biomass utilization of the sampled plants growing vigorously were
140434 m3/m3/t, 3266 m3/m3/t/d, 58.46 %, respectively. During the process of the anaerobic digestion,
plant nutrient such as N and P had less change and exited in the fermentation system. The results
suggested that ecological protect and energy production could exist in a circulation system, which might
be most deeply studied to maximize the benefits.