Using a low-melting-point polymer, copolyamide, as raw material, adhesive meltblown webs were formed on the ordinary melt-blowing line by using the accessory air and the accessory air chamber. The webs thus produced exhibit narrower fiber diameter distribution and a more uniform pore structure. At the same time, four main melt-blowing parameters, the primary air pressure, the accessory air pressure, the melt throughput rate, and the die-to-collector distance, are discussed in terms of their influence on geometric mean diameter of fibers and fiber diameter distribution.