Abstract: Prepregs were irradiated with different doses by low energy E-beam and placed layer by layer, then the preforming laminate was thermal post-cured with different temperatures to prepare composite. The effects of irradiation dose and the post-curing temperature on the interlaminar properties of composite were studied. The results show that the irradiation dose on the upper surface of the prepregs had the greater influence on interlaminar shear strength (ILSS) than the post-curing temperature, and the irradiation dose on the bottom surface of the prepreg had the smallest influence. The composite obtained the best ILSS of 66.3 MPa when the total irradiation dose(the sum of irradiation dose on the upper surface and bottom surface of the prepregs) ranged from 100-130 kGy. The ILSS decreased as the total irradiation dose with more than 130 kGy because of the poor adhesion between adjacent layers caused by increase of average curing degree. The post-curing temperature had a great influence on the curing rate of irradiated prepregs after irradiated with low energy E-Beam. The low post-curing temperature can improve the adhesive property and the composite could get a high ILSS when upper and bottom surface of prepregs were completely cured.