Consular authentication is an international convention gradually formed by exchange practice of documents for mutual convenience. At present, except for the clause of "Exempt from authentication" in bilateral judicial assistance treaties, China has not signed any bilateral treaty or agreement on mutual exemption of consular authentication with any country. In generally, civil and commercial documents issued in a foreign country to be delivered and used in China shall need consular authentication from the Chinese Embassies or Consulates in the local country.