An experimental apparatus was used to measure the solubility of ethylnitrite in mixedsolvents under the lower pressure and higher temperature. The solubilitiesof ethyl nitrite inmixed solvents of ethanol-water at 15° C---40° C and ethanol-diethyloxalate at 20° C---40° C weredetermined. A Henry constant model has been improved, and the interaction parameters havebeen fitted from experimental data. The calculation results have been compared withexperimental data; the results obtained are satisfactory.