The high speed SJPL series stretching line is adopted micro-processor control, frequency conversion governor and setting and displaying technical data may be fully digitized on the basis of absorbing international advanced techniques. The structure of the line is compact with a pleasing appearance, smooth running, flexible and reliable control, sophisticated manufacture engineering, convenient operation and reliable production, it can be used in producing flat fiber form thermoplastic, such as polypropylene (PP) and high-density polyethylene (HDPE) etc.