An epoxy resin based on DGEBA has been modified with polycarbonate(PC) by a new reactive blending method which can result in a single phase blend. The supermeolecular structurte of PC/epoxy blends can be controlled by these reactive blending process, which utilize the intermolecular interaction via hydrogen bonding or chemical reaction between the components. The kinetic of the curing reaction of the neat resin and of PC/epoxy blends were analyzed by dynamic DSC. Combination feature of dynamic mechanical spectra and infrared spectra of products can give an evident characterization of their supermolecular structure.