In this study, rice husk was selected as the feedstock, and pyrolysis experiments were conducted in a fixed-bed tubular furnace to systematically evaluate the influence of temperature on product distribution and the evolution of oxygenated compounds.With increasing temperature, the liquid yield decreased from 45.8% to 33.1%, whereas the gas yield rose from 13.6% to 34.6%. Temperature was identified as the dominant factor governing the generation and transformation of oxygenated species. At temperatures below 600 ℃, phenolic and furanic derivatives, such as phenol, cresol, furfural, and furfuryl alcohol, were the predominant liquid products, accounting for 14.14%—62.92%. At higher temperatures (> 600 ℃), these compounds were progressively converted into aromatic hydrocarbons through decarboxylation and aromatization. This study elucidates the temperature-dependent evolution of key oxygenated compounds and provides technical guidance for the regulation and valorization of tar during the thermal conversion of agricultural and forestry residues.