Abstract: In this article, effects of reaction temperature, hydrogen partial pressure and other process conditions on C_A value, 8 kinds of polycyclic aromatic hydrocarbons (PAHs), etc. of green rubber oil were studied in a pilot trickle-bed reactor by naphthenic vacuum gas oil. The results showed that under the condition of hydrogen partial pressure 10-15 MPa, volumetric space velocity between reference to reference + 0.5 h^-1, and reaction temperature between t to t + 60 ℃, it was appropriate for hydrofining process to produce green rubber oil, in which the C_A value was over 12% and mass concentration of benzo(a)pyrene and other PAHs met the EU environmental requirements. There would be a wider operating space (reaction temperature range) for production of green rubber oil by hydrofining process at a higher hydrogen partial pressure, lower volumetric space velocity. What's more, the operating temperature range led to lower temperature area, so there would be a higher yield of green rubber oil.