Double layer BOM include 1+1 complex structure double BOM and double warp structure BOM. 1+1 complex structure BOM is congruenced by two kinds of base cloth. According paper machine and paper, to change the structure of base cloth. It has the characters of anti-high pressure, good elasticity and filterability, stable size, small elongation, great strength, affective to eliminate grooving, vaccum mark blind hole mark and other marks. Suitable to vaccum press, kinds of complex press and other presses for producing high grade offset paper, and kinds of high grade paper and paper board etc.