Abstract: The liquid hydrodynamic behavior of slurry reactor was studied in a system of nitrogen-diesel-solid particles. The influence of operating conditions and physical properties of the system on the hydrodynamic parameters was investigated. The experimental results show that this column was operated in the heterogeneous regime. The slip velocity increased with the increase of average gas holdup. The average gas holdup and slurry velocity increased with the increase of pressure and gas superficial velocity, but decreased with the increase of solid holdup. Correlations were developed to predict slip velocity, average gas holdup and slurry velocity. Calculated results by the correlations agreed with the experiment values very well with the relative error less than 10%.