Australian National Police Certificates
A National Police Certificate (NPC) is a summary of your offender history in Australia. It's sometimes called a national police check. You should contact the Australian Federal Police directly to arrange issue of an Australian national police certificate.
If you need a certified copy of your AFP national police certificate (eg. for a Chinese visa application), you must request a paper version of the police check be mailed to you. Only original documents can be notarised. See Certifying true copies of original documents.
Chinese Police Clearance Certificates
You should contact the local Public Security Bureau (PSB) Entry & Exit Office directly to obtain a police clearance certificate or a Chinese government Notary Public Office. The Consulate-General cannot issue Chinese police clearance certificates.