Abstract: The reversed-phase high performance liquid chromatographic method for analysis of ionic liquids bmimPF₄、bmimPF₆、bupyPF₄ high boiling point organics naphthalene、phenanthrene、diphenyl、DBT、Diphenyldisulfide in them.Peak shape was improved by adjusting pH of mobile phase with buffer solutiom.The nature is qualitatively measured by retentive time,and quantitative analysis is carried out by external standard.The series of methods is significant to determine the solubility of high B.P.organics in ionic liquids.