Abstract: Biomass is a renewable energy resources. By utilizing flash pyrolysis technology, the sawdust was converted into liquid product(bio-oil)which is of easy storage , transport, handling and high energy volume density .The rotating cone flash pyrolysis system was tested to produce the bio oil. The bio-oil was experimented in air pressure rectification and lower pressure rectification and then the different parts of it were analyzed by GC-MS and nuclear magnetic resonance equipment.