Abstract: This work,by adopting modified Ellis equilibrium still,and using methods of chemical analysis and micro-extraction with technique of simulated true boiling point distillation with gas chromatography for sample analysing,determined the VLE data at normal pressure for four systems of furfural-raffnate oil,furfural-extract oil,N-methyl-2-pyrrolideraffnate oil,N-methyl-2-pyrrolide-extract oil.The data were correlated by pseudo-component method combinating with model of Chao-Seader. The results are satisfactory.