Liquid phase hydrogenation of p-chloronitrobenzene to synthesize p-chloroaniline is systematically studied,and we mainly focused on the influence of catalysts,solvent,dehalogenation inhabitant and reaction pressure. Under the optimized condition,i.e. 1% Pd/C as catalyst,industrial spirit as solvent,morpholine as dehalogenation inhabitant,with reaction temperature 80~90 ℃,reaction pressure 1 MPa and reaction time 2.60 h,the conversion ratio of p-nitrochlorobenzene is 100%,with the yield of p-chloroaniline 95...