Poly(vinyl cinnamate) had excellent resolution and no dark reaction and high etch resistent. But is was developed in polar solvent. A aqueous-photopolymer was synthesised for improvment of developability. Poly(vinyl cinnamoyl acetate)(PVCiA) and aqueous-PVCiA(PVCiA-s) was prepared and was characterized with H-NMR. The characteristic of sensitivity and developablity of coating was investigated by Grayscale method.