Abstract: This paper shows that the differential scanning calorimetry (DSC) is a very useful tool for the characterization of properties (e.g. photosenskivity and storage stability) of photopolymerizable resin containing poly (vinyl alcohol). Pour systems of the photopolymerizable resins (S₁, S₂, S₃, S₄) were studied with DSC. Results reveal that the order of photosensitivity for the above gfiving samples is as follows: S₄>S₃>S₁>S₂. The addition of maleic anhydride (MAn) speeds up the photopolymerization, but makes storage stability worse. However, when MAn is esterified by hydroxy-ethyl methacryla-te and then added to the system, both photosensitivity and storage stability are improved.