In China, fossil fuels are still the main energy sources presently. With increased concerns on energy security, climate change and environmental pollution, developments of renewable energies are becoming more and more important (Zhang et al., 2007). Lignocellulosic biomass, such as agricultural residue, forest waste and municipal solid waste, is abundant and widely available as renewable resources. The estimated annual yield of these biomass materials is more than 0.7 billion tons in China (Zhang et al., 2007).