In this study, the effect of temperature and catalyst on hydrothermal liquefaction of biomass was investigated. At the end of the experiments, prosopis farcta plant was transformed to solid residue (bio-char) and liquid products (heavy bio-oil, light bio-oil) at temperatures of 250, 300 and 350 degrees C with catalyst (H3BO3, Na2B4O7 center dot 10H(2)O, NaOH) and without catalyst by hydrothermal liquefaction. The liquid and solid products obtained at the end of the experiments were analyzed by GC-MS, FT-IR, 1 H NMR, SEM and elemental analysis methods. The highest liquid product yield was obtained at 350 degrees C with sodium tetraborate catalyst as 35.69%. According to the elemental analysis results, the HHV values of the liquid products range from 19.75 to 29.54 MJ kg(-1) for 300 degrees C and from 18.06 to 30.02 MJ kg(-1) for 350 degrees C. HHV values of all obtained liquid products were found to be higher than raw materials.