Abstract: An encapsulant material with enhanced light reflectivity, a crystalline silicon photovoltaic module and a thin film photovoltaic module are provided. The encapsulant material has a porous structure therein, and an average pore diameter of the porous structure is between several hundreds of nanometers and several hundreds of micrometers, so that the light reflectance of the encapsulant material is improved. Moreover, the encapsulant material is crosslinked by a physical or chemical crosslinking method, so heat resistance thereof is improved. Therefore, the encapsulant material is suitable for the crystalline silicon photovoltaic module and the thin film photovoltaic module, so as to increase power conversion efficiency of these modules.