Standing Seam System RRF - 1 Standing Seam system is usually use in the roofing that gradient is less than 25°.? The system is being to the first choice in roofing configuration since it appeared in technique literature on 1899.? The name “standing seam” shows its special characteristic in lengthways joint.? Early time, the flange height is 23mm, but through improve the technique of prefab bottom panel, 25mm height is becomes the international current standard.? The bend and pressurize fabrication of flanges can complete by manual or mechanical way and easy complete the special designs as gibbous curve, concave curve and conical combination and so on, especially in line design, it can increase the modern charm for building. [The main characteristics of RRF-1] a) Waterproof and drainage function come true by whole configuration. b) Simple, light and safe configuration. c) Flexible, fast, correct and economical construct installation. d) Don’t need any silica gel to sew, it avoid the pollution by silica gel aging and extend the life. e) Nature circle aeration configuration. f) Easy to three-dimensional bending desig.