Detention center refers to the place where the public security organs temporarily detain criminal suspects for suspected criminal offences for which the court has not yet made a judicial judgment. Organs of criminal suspects who have been arrested and criminally detained according to law. If the remaining sentence of a criminal sentenced to fixed-term imprisonment is less than three months before delivery for execution, the detention center shall execute it on his behalf. Meeting in detention center can be divided into lawyer meeting in criminal proceedings and delivery after trial, and the remaining sentence of the executed criminal is less than three months, so the family members serving their sentences in detention center can meet directly without being sent to prison.