Abstract: The present invention has a good method of opening envelope and primarily having to provide a better ease of opening method. Its structure is distinctively different from the traditional envelopes or tears open envelopes with characteristics a line of perforation is set on one of the four folding lines of cover flaps. Furthermore, a 2 to 3 mm wide of tenacious tearing wire is adhered to the line of perforation having one end of it consists of an angled tearing line. To open, simply tear from the angled tearing line and lightly pull the tearing wire along the line of perforation towards the opposite end, which allows the tenacious self-adhesive tearing wire to break free from the line of perforation and effectively cutting the envelope open from the line of perforation. It has characteristics that consist of ease of manufacture, ease of use and high reliability of prevent from unintentional opening.