lnterconnect of intelligent stitch length adjusting, intelligent thread tension adjusting, system and material thickness detecting system, which realized high level sewing eratı that pattern sewing, bar-tacking, eliminated the intensive stitch and uneven thread tensi on during step sewing process. Smart phone APP control parameter adjusting is available. Realizing material searching, information upload and download, statistic analysis, fault diagnosis and software upgrade and so on (Optional). Touch screen control. rnore intuitional and convenience when complete cornplicated prograrnmable sewing. No need pre-winding far bobbin winder, rnore sirnple and efficient. inside auta foot lifler mechanism, reliable, elegant. Needle prevent function efficiently solved needle broken problem during back tacking sewing process of heavy material. New digital nipper device efficiently decreased bird nest phenomenon. Bottom lines detect function, reliable, stable. (Optional).