Abstract: The holograhic transmission grating is recorded in the photopolymer,which is composed of the acrylamide radical monomers and sensitized by yellowish erosion.The effect of such factors as spatial frequency,exposure intensity and time on gratings' diffraction efficiency is studied with experimental method.The experimental results show that the grating spatial frequency,the exposure intensity and time have a preferable and related range where the diffraction efficiency could arrive at the maximum.When the grating's spatial frequency is near 2751line/mm,the exposure intensity is between 12mW and 15mW and the exposure energy is 770mJ/cm2,the diffraction efficiency arrives at the maximum.The maximun diffaction efficiency is about 75%,higher than some other holograhic gratings.