Each province has its own "examiner database" and selects examiners through the examiner qualification examination system. These selected examiners will be informed of the meeting, conduct interview training in advance, and finally hold a round of lottery to decide the final examiner. Once the examiner is selected, he needs to hand over all communication equipment, and can call home to explain the situation under the supervision of the supervisor. In some areas, inter-provincial selection is also implemented, and examiners are selected from the provinces and cities next door to interview candidates in the region.