Abstract: The experiment on the non-catalytic steam gasification of bio-oil was carried out in a lab-scale fixed bed reactor. The influence of operating parameters such as the temperature and the mol ratio of steam to carbon (S/C) on the gas yield and composition was investigated. The results show that increasing temperature can enhance the conversion of bio-oil to syngas; the carbon conversion of bio-oil can be as high as 97.8% at 1 200 ℃, and the proportion of effective gas component (H₂+CO) in the product gas is nearly 77% with a mol ratio of H₂/CO=1.19. The mol ratio of H₂/CO increases with an increase of S/C mol ratio, and reaches up to 3.69 at S/C=4. However, the addition of steam does not favor the increase of the composition of effective syngas. The product gas from steam gasification has a medium heating value.