Abstract: This paper reports the solubilities of salts in mixed solvents of DMSO or DMF with 1 enzene,toluene and p-Xylene or rarlon teirachloride.The result Is in accord with the empiricalformula Apreliminary discussion on was given.Based on the nrod-ifled Porn equation,the transrer Gihis free energy formula has been got,and the app oach of Kis given asThe meanns of the aho e formula,calculaed value and condition of ionic solvation veed seussed.