The 2.5 layer forming fabric adopts a unique multi layer structure, which is between the double layer and triple layer forming fabric. Sun Hong adds transverse braiding wires on the top of the double layer forming fabric. This design takes into account the fiber retention rate and does not affect dehydration. Compared with the double layer forming fabric, the 2.5 layer forming fabric greatly increases the fiber support, is more wear resistant and has a longer service life.