The application of laser multibeam combining technology in the field of electro-optical countermeasures is receiving increased attention. This study proposes a laser multibeam method using a refractive prism group and three flint glasses (grades H-ZLaF92, D-ZLaF85LS, and H-ZBaF21) as the prism materials. By calculating and simulating the vertex angle, incident angle, and position relationship of the prism group, a beam combination scheme is designed based on the use of an adjusting mirror group, refracting prism group, reflecting mirror group, and polarizing filter. The reflection loss is reduced by adjusting the electric vector direction of a single, linearly polarized laser beam parallel to the incident plane. The analysis and calculations show that the wavelengths, incident angles, and apical prism angles of the three materials are 550, 1060, and 2000 nm; 63.05, 61.35, and 59.58; and 51, 55, and 60, respectively. When the spot distances ΔX₁ and ΔX₂ are 10 and 20 mm, respectively, the far surface distance D and near surface distance d values of the three materials corresponding to the prisms are 289 and 83.5 mm; 366.4 and 107.7 mm; and 381.6 and 103.6 mm, respectively. Without optical coating, a beam combining efficiency in the range of 92.8%-97.6% can be achieved using only a single linearly polarized light incident at the Brewster angle. Compared with the existing laser multibeam method, the proposed method has considerable cost advantages.