The consular legalization is an activity of diplomatic missions or consular authorities to validate documents in the name of the country. The consular authority will not authenticate a document in any of the following circumstances:

1.The seal and signature of the document is not true;

2. The seal, signature of the document is not on record, or is inconsistent with the record;

3. Document binding, seal, signature and other technical standards do not conform to the regulations and requirements of the authority to issue the document and the authority to use the document;

4. The contents of a document may cause potential threats to China's national or public interests;

5. Other circumstances that the consular authority cannot accept.