The pseudo-pinch point zone in a distillation column is the stages where the liquid or vapor composition varies very little，and it is very useful for the operation and design of the distillation column.In this paper，the evolution of the pseudo-pinch point zone and effects of reflux ratio and relative volatility to pseudo-pinch point zone in multi-component batch distillation were studied by simulation，based on a constant molar hold-up batch distillation model.The width of the pseudo-pinch point zone was affected by reflux ratio and relative volatility.The pseudo-pinch point zone in multi-component batch distillation changed continually and it always alternated between the upper pseudo-pinch point zone and the middle pseudo-pinch point zone.