The vast majority of the competent authorities of non parties to the Convention, such as the internal affairs, civil affairs, justice and other departments, only accept foreign documents authenticated by their own diplomatic or consular agencies. If only the consular authentication of the Consular Department of the Ministry of Foreign Affairs or the local foreign office entrusted by it is handled for foreign language documents, but not the consular authentication of the embassy or consulate in China of the country where the document is used, the country where the document is used will refuse to accept it. Therefore, under normal circumstances, foreign-related instruments sent to countries not party to the Convention for use need to be double certified. Only when the party concerned determines that the country where the document is used only requires the authentication of the foreign related document processing form, can it only handle the consular authentication of the Consular Department of the Ministry of Foreign Affairs or the local foreign affairs office entrusted by it, and not handle the consular authentication of foreign embassies and consulates in China.