In order to improve the mechanical property and water vapor barrier property of paperboard, PCL/ Paperboard bilayer film was prepared through thermo-compression technique. Tensile test, dynamic mechanical analysis (DMA) and water vapor permeability (WVP) test were conducted to assess the mechanical, thermodynamics and barrier behavior of the film before and after laminating. Heat-seal property of PCL and recycling test of paperboard was also explored. The results showed that the tensile strength of bilayar film is improved by 3 times, Young's modulus is improved by 5 times, and water vapor barrier property increases significantly after PCL laminating by comparison with the paperboard; content of PCL and platen temperature has significant influence on seal strength; paperboard recycling is fast and the average recovery is 99% .