In a classical Lennard-Jones potential model, we present molecular dynamics study on thermal conductivity of porous argon thin films. It shows that thermal conductivity of porous argon thin films is remarkably lower than that of pure argon thin films. Larger porosity results in lower thermal conductivity, A thermal conductivity model based on parallel method is used to analyze thermal conductivity of argon porous thin films. It shows that pore configuration in film affects thermal conductivity.