Distillate from atmospheric distillation of bio-oil accounts for about50%by weight. Bio-oil can't be applied for requiring complete evaporation before combustion, but can be employed for atomizing combustion. The composition of bio-oil is complicated, phenols derived from lignin can be extracted by vacuum distillation or/and steam distillation. And the distillation method can also be used to improve the ov erall fuel properties of bio-oil such as stability,  heat value, the pH value and so on.