Polyester fiberglass mat for wall board (gypsum board composite Mat) is produced from the mixture of glass fiber and polyester fiber by wet lay-out process. The combination of glass fiber and polyester fiber gives the polyester fiberglass mat combined the flexible features of polyester fiber and stability features of glass fiber and make the surface of the mat be more comfortable for touching and minimized shortcomings of both fibers. The polyester fiberglass mat gives the gypsum board excellent features of water proofing, break strength, anti-UV, anti-septic, anti-wrinkle and so on. This material is specially tailored for gypsum board / drywall industry, has easy soakage and good lamination to gypsum wall board, with flat and smooth surface, it’s a healthy and environmentally friendly material; all these features ensure an efficient production and result in smooth and highly-qualified gypsum board in this industry.