Since the Ministry of Public Security has not made uniform provisions on the formalities for the engraving of seals, the public security organs around the world have different provisions on the formalities for the engraving of seals. According to the different types of seal engraving, the procedures are not the same. First, the engraving of the party and government, state-owned or collective enterprises, institutions and their internal institutions of the official seal, all with the unit's higher level of leadership or approval of the establishment of the department issued by the document or letter, to the unit's location above the county level of the public security organs of the public security department for approval procedures, the public security organs examined by the seal engraving notification form issued by the public security organs, or a letter of introduction, certificates, etc., to the public security organs designated engraving factory or engraving shop engraving official seal. The official seal is engraved in the engraving store designated by the public security organs. If a school carves a seal, it must hold a certificate issued by the education administration department and go to the public security organ above the county where it is located to go through the examination and approval formalities, and only after approval can it be carved in the designated engraving store or factory. The seal of the local social organizations, by the local association registration and management authorities to issue a certificate, by the public security organs where the headquarters of the association for approval of engraving formalities, by the local association registration and management authorities for issuance. Overseas units need to engrave the seal, first of all to the unit's place of origin at or above the county level public security organs for seal engraving letter of introduction or proof, and then with this letter of introduction or proof to the engraving factory or engraving store at the same level of the public security organs in exchange for engraved seal notification form or letter of introduction to the public security organs designated engraving factory or engraving store engraving. Second, the engraving of state-owned, collective enterprise units of the financial chapter, contract chapter, business seal and the bank's transfer chapter, cash received chapter, cash paid chapter, need to be issued by the unit with a letter of introduction and business license to the unit's location at or above the county level of the public security organs for the record, by the public security organs, after examination, the issuance of notice of the engraving of the seal or a letter of introduction to the public security organs to the engraving designated engraving plant or engraving store engraving. Three-funded enterprises to engrave the above seals, with the business license and "three-funded enterprises for the record", if the enterprise is a Sino-foreign equity joint venture, Sino-foreign cooperative enterprises, must be executed by the Chinese side of the letter of introduction, to the unit where the public security organs at or above the county level for the engraving of the seal notification or letter of introduction, and then with the notification or letter of introduction to the public security organs of the engraving designated engraving factory or engraving store engraving. Engraving seal need to hold a "special industry license" engraving unit engraving official seal, all private engraving official seal is illegal, the engraved seal without any legal effect.