The procedure of summoning a police officer is as follows: 1. When summoning a criminal suspect, he should show his summons card and the people's police card of the investigator, and order him to sign and fingerprint the summons card; 2. After the criminal suspect arrives at the case, he shall fill in the time of arrival on the summons card. At the end of the summons, it shall fill in the time of the end of the summons on the summons card. If the criminal suspect refuses to fill it out, the investigator shall indicate it on the summons card; 3. For the criminal suspect found at the scene, the investigator can summon him orally after showing the people's police card, and inform the summoned person of the reasons and basis. In the interrogation record, the way of the criminal suspect's arrival at the case shall be indicated, and the time of arrival at the case and the end time of summons shall be indicated by the criminal suspect.

article 119th of the criminal procedure law of the people's Republic of China

? A criminal suspect who does not need to be arrested or detained may be summoned to a designated place in the city or county where the criminal suspect is located or to his residence for interrogation, but the documents of the people's procuratorate or the public security organ shall be produced. A criminal suspect found at the scene may be summoned orally upon production of his work certificate, but it shall be indicated in the interrogation record. The duration of the summons or summons shall not exceed twelve hours; If the case is particularly serious and complicated, and detention or arrest measures are needed, the duration of the summons or compulsory summons shall not exceed 24 hours. A criminal suspect shall not be detained in disguised form in the form of continuous summons or forced summons. When summoning or detaining a criminal suspect, the criminal suspect shall be guaranteed food and drink and necessary rest time.