The theoretical photochemical and photopolymerization diffusion model and the dynamic parameters of the photopolymer are studied. A new holographic photopolymer which is composed of acrylamide as monomer, ployvinylalcohol as binder, triethanolamine as initiator sensitized by erythrosine B is prepared. By means of fitting the experimental data of transmittance and diffraction efficiency as a function of time, the influence of the molar-absorption coefficient ε, the quantum yield Φ and the photobleaching coefficient k in photochemical dynamics for different concentrations of erythrosine B, and polymerization rate k0, diffusion time constant τD and the maximal refractive index modulation Δn in photopolymerization diffusion dynamics for different exposure intensity, are presented.