This standard specifies the technical requirements, test methods, inspection rules, marking, stacking and transportation of prefabricated II-shaped reinforced concrete skylight frames, specifications, dimensions and model compilation methods. This standard is applicable to general single-story industrial factories with a spacing of 6m, and skylight frames in non-seismic areas and areas with earthquake ruptures of 6-8 degrees. For components in a corrosive environment, if the surface temperature is higher than 100°C or there is a production heat source, and the surface temperature of the component is often higher than 60°C, relevant current national standards and specifications should be followed.