Knitting process, according to different technological characteristics, knitting production is divided into two categories: weft knitting and warp knitting. In the weft-knitting production, the cheese can be directly produced on the machine after the raw material has been winded. Each yarn is sequentially placed on each needle of the weft knitting machine along the weft direction to form a weft knitted fabric. In the warp knitting production, the raw materials go through winding and warping, the yarns are wound in parallel to form a warp beam, and then produced on the machine. The yarn is retreated from the warp beam, and each yarn is placed on one or at most two knitting needles of the warp knitting machine along the longitudinal direction to form a warp knitted fabric. On some knitting machines, there are also methods of combining weft knitting and warp knitting. At this time, two sets of yarns are arranged on the knitting machine, one set is inlaid according to the warp knitting method, and the other set is inlaid according to the weft knitting method. The knitting needle forms the two sets of yarns together to form a knitted fabric. The loops formed by the same yarn are arranged along the weft direction in the weft knitted fabric, and along the warp direction in the warp knitted fabric.