what is criminal record

It should be the non-criminal record, which is used to prove that you did not commit any criminal deeds in the past. If you are in your country now, the record should be issued by the relevant authorities in your country and then certifified by the Pakistani Foreign Affairs Ministry. Before the document is send to China, it had to be attested by the PRC embassy there. If you are now in PRC, you can see if the Pakistani embassy can help you to get the non-criminal record.