Superlegalization is a higher authentication of a public document which confirms that the document was issued by the relevant authority. Superlegalization is being done by verification of legalization on the particular document.

Certain documents (birth certificates, marriage certificates, criminal record characters, university diplomas etc.) that are to be used and submitted in the Czech Republic for various reasons (eg. marriage, application for a long-stay visa /residence permits etc.) are required to be superlegalized.

Original of the document that was previously authenticated (legalized) by the local office of Ministry of Foreign Affairs of China need to be submitted.

For more information please see here. 

Please be aware that documents such as birth certificates, marriage certificates, non-criminal records, university diplomas etc. must be superlegalized.