How does the Australian Immigration Bureau know that your China birth certificate is true or false?

The Australian Immigration Bureau may verify the authenticity of your China birth certificate through various channels. Here are some possible ways:

1. Notarization of birth certificate: In China, birth certificates usually need to be notarized before they can be recognized. Therefore, the Australian Immigration Bureau may ask you to provide a notarized China birth certificate. The notary office will verify the birth certificate to ensure its authenticity and legality.

2. Translation and certification: The Australian Immigration Bureau may require you to provide a certified translation to ensure the authenticity and accuracy of the birth certificate. The certification body will verify the translation and confirm the qualifications and translation accuracy of the translators.

3. Investigation and verification: The Australian Immigration Bureau may contact relevant departments in China to verify the authenticity of your birth certificate. This may require the provision of additional information and documents.

In short, the Australian Immigration Bureau has taken various measures to ensure the authenticity and legality of birth certificates. In case of doubt, it is recommended to consult an immigration lawyer or relevant institutions.