This is what I found on China (state.gov)
Police Records
Available
Fees: Varies. Normally RMB 200 - 300 (Notarization Fee: RMB 80 + Translation Fee: Non-standard)
Document Name: Notarial certificate (Gong Zheng Shu)
Issuing Authority: Local Notary Public Office (Gong Zheng Chu)
Special Seal(s) / Color / Format:
There are two types of notarial police certificates: notarial certificate of no criminal record and notarial certificate of criminal record.
Notarial certificate of no criminal record: Certifies that the applicant has no criminal offense during his or her residence in China. It indicates the applicant’s name, gender, date of birth, ID number, and period of residence in China. NOTE: Notarial certificates of no criminal record issued prior to 2012 may not list the ID number.
Notarial certificate of criminal record: Certifies the applicant’s criminal offense and sentencing during their residence in China. It indicates the applicant’s name, gender, date of birth, ID number, conviction information, nature and date of conviction, and date of release. Some certificates also attest that the applicant has no other criminal record beyond the convictions already described. NOTE: Notarial certificates of no criminal record issued prior to 2012 may not list the ID number.
A notarial police certificate normally contains a watermark, seal, and red stamp. All notarial documents must have an English translation, and be attached to a certificate stating that the English translation is in conformity with the Chinese original.
Issuing Authority Personnel Title: Notary Public (Gong Zheng Yuan)
Registration Criteria:
A National ID card and household registration (Hu Kou Bu). If the applicant lives abroad, a copy of his or her passport is also required.
If the applicant is a foreign passport holder, the following documents are required:
Valid passport, and all Chinese residence permits or visas.
Registration form of temporary residence for foreigners.
Chinese permanent resident card if applicable.
Certificate of no criminal offense, or certificate of criminal offense, issued by the Public Security Bureau.
Photographs - at least two.
A signed affidavit or authorization certificate from the applicant if someone other than the applicant applies for the certificate on his or her behalf. The authorized person also needs to provide his/her national ID card.
Other documents requested by the Notary Public (Gong Zheng Yuan).
Procedure for Obtaining:
Complete an application and submit all relevant documents to the Notary Public Office (Gong Zheng Chu).
The Notary Public then examines the documents. If the application is accepted, the applicant pays all related notary fees.
Once the review of the submitted documents is completed, the notarial police certificate is issued.
Certified Copies Available: Certified copies are not available.
Alternate Documents: There are no alternate documents.
Exceptions: Police records are not available for those who were in China in diplomatic status including those working for international organizations, such as the United Nations.
Comments: While standardized procedures to apply for a notarized document exist in China, in practice, procedures vary depending on locale. Applicants should check the website or contact their local Notary Public Office to obtain specific information regarding required fees and supporting documents.