Owing to high precision, strong reflection, small volume and weight, polyhedron prisms are widely used in digital cameras, fingerprints, cystoscopies and other common digital equipment, science and technology and medical instruments. But, as for the production of polyhedron prisms, the levels of domestic manufacturers are really uneven. The angle tolerance that they control is 1-5 arcmin, surface accuracy is only 1/4 lambda, and surface scratch/dig is generally 40-20 under the inspection of normal bulbs. Besides, the number of faces of and angles that can be produced are limited to conventional polyhedrons. The polyhedron prisms fabricated by CPG are mostly customized. The shapes are irregular and rare. The special angle tolerance can reach 0.5arcsec, surface accuracy is 1/20 lambda or better. We guarantee surface scratch/dig 10-5 inspected under blue cold light. The polyhedron prisms manufactured by CPG can be used in high precision fields, such as super laser and celestial range.