Two kinds of sliced raw materials with different properties are extruded by independent screw extruders, and then melted and spun into a net and reinforced to form a functional nonwoven fabric. The biggest advantage of this technology is that products with different properties can be produced by different raw materials and different composite forms, which greatly expands the development space of spunbonded nonwovens technology. At present, there are four kinds of bicomponent spunbonded fibers: sheath-core type, side-by-side type, orange petal type and sea-island type.