An in-lab unidimensional soil-column venting experiment was conducted with sandy soil to investigate mass transfer process of non-aqueous phase liquid(benzene) in the soil vapor extraction system composed of gas,water,oil and solid substances at four moisture levels(0%,21.9%,36.6% and 51.2%).Results of the experiment were compared with those of the prediction using the Local Phase Equilibrium Model(LPEM) and Non-Equilibrium Kinetic Model(NEKM).When the moisture level was 0%,the LEM model fitted well the ventilation process of the soil column;but with the moisture level rising,its prediction seriously deviated from the experiment results.However,in this case,the prediction of the NEKM model fitted better with the experiment results.The findings show that moisture level of the soil affects Gas-NAPL mass transfer.The LPEM model may be used to describe the process of SVE remediation in dry soil,whereas the NEKM model should be used in soils higher in moisture content.