Abstract: Two-stage hydroupgrading technology was studied in a pilot plant to produce clean transportation fuels from full-range fractions of coal tar. The effect of the process parameters, such as temperature, hydrogen partial pressure, LHSV and H2 to oil ratio, on the properties of hydrotreated oil was investigated. The hydrocracking process for the hydrotreated tail oil was carried out to determine the appropriate conditions. The results indicate that coal tar could be turned into light clean fuels under appropriate hydro-upgrading conditions and the total yield of naphtha and diesel is more than 95％. The sulfur content in the diesel fraction is less than 10?g/g and its cetane number is close to 45. The stability test of hydrotreating catalyst is conducted for more than 2 600 h, and the product properties remain stable. The hydro-upgrading results indicate that this technology realizes the purpose of clean utilization for coal tar and could be used in commercial unit for long-term operation.