Analytical　chemists　learn　the　polarity　of　chromatographic　stationary　phase　by　testing　the　Rohrschneider-McReynolds　constants　in　chromatographic　columns,　while　chemical　engineers　acquire　the　selectivity　and　solubility　of　solvents　by　determining　solubility　parameters.　However,　in　evaluating　the　properties　of　ionic　liquids,　they　are　not　as　useful　as　in　general　solvents.　Sometimes　the　probe　molecules　have　no　peaks,　and　sometimes　the　solubility　parameters　calculated　are　not　as　what　we　predict.　In　order　to　overcome　the　shortages　of　the　existing　methods,　a　comparative　chromatographic　method　was　established,　in　which　a　well-known　ionic　liquid　was　used　as　a　reference　stationary　liquid　into　the　reference　column,　and　new　design　ionic　liquids　as　a　sample　stationary　liquid　filling　into　the　sample　column.　With　7　solvents(n-hexane,　ethyl　acetate,　benzene,　2-ketone,　pyridine,　n-butanol　and　nitro　propane)　as　probe　molecules,　the　adjusted　retention　time　and　asymmetry　factor　as　the　index,　the　target　ionic　liquids　can　be　selected.