The purpose of this specification is to specify the technical requirements, mass assurance provisions, delivery preparation and description matters of epoxy resin/Glass cloth prepreg, etc. Applicable to the design, manufacture, delivery and use of Glass cloth reinforced epoxy resin prepreg. A series of relevant standards are cited, including performance test methods for fiber reinforced plastics and physical performance test methods for composite prepreg. Appearance of prepreg is required to be uniform, no obvious defects are allowed, and defects such as metals, Non-metallic particles, and curing materials are not allowed. Requirements for defect identification are specified.