The document summarizes research on the thermal decomposition of lignin in the presence of a hydrogen donor solvent (2-propanol). Key findings include: 1) The maximum bio-oil yield of 42 wt.% was achieved at a reaction time of 15 minutes. Further increasing the reaction time did not significantly increase yields. 2) Analysis showed the reaction produced short-chain alkylphenol compounds as the 2-propanol solvent donated hydrogen atoms, reducing unsaturated bonds on the aromatic rings. 3) Gas chromatography/mass spectrometry analysis identified 19 monomeric phenolic compounds in the bio-oil, and their percentages increased with longer reaction times.