Abstract: Abstract: Phenolic compounds were separated from the 5 MW industrial biomass gasification tar by liquid liquid extraction using alkali and acid. Three fractions were isolated from the tar by distillation and phenol content of each fraction was determined. The fraction I of the highest content of phenolic compounds was selected for alkali and acid extraction process. The crude phenol was analyzed by GC/MS. The mass fraction of phenols in 100—180 ℃, 180—210 ℃ and 210—235 ℃ fractions was 51.86%, 20.46% and 12.86%, respectively. The optimum extraction process parameters of 100—180 ℃ fraction were as follows; alkali mass fraction of 20%, reaction time of 5 min, reaction temperature of 50 ℃; acid mass fraction of 20%, reaction time of 30 min and reaction temperature of 22 ℃. Meanwhile, the recovery yield of crude phenol was 50.24%.There were 42 types of phenolic compounds in crude phenol, which contributed the 98.49% in quality, and the mass fraction of low rank phenols was 73.90%. This research can provide reference for high value added use of biomass gasification tar.