Foreign trademark territorial extension refers to the application by the registrant of an international trademark registration to designate his or her trademark to a Madrid Union member state for protection. An application for territorial extension can be filed during the international registration of a trademark or after the international registration of a trademark is completed, which is divided into "territorial extension application" and "late territorial extension application".

"Application for territorial extension" means that when the applicant applies for international registration of a trademark, he names the country requesting protection in the relevant columns of the application for international registration. Both the international registration and the "application for territorial extension" At the same time; "late extension application for territorial extension" means that after the registrant obtains international registration for its trademark, it needs to apply for adding a country for trademark protection in the member states of the Madrid Union. This application is made after the international registration of the trademark.