秦、漢時期的亭，建築規模不一，要視實際政策需要及當地治安需求而定。經研究發現，秦、漢時期的亭至少肩負了八項職責，此與亭之建築規模正可相互呼應。「亭」通常有樓、有室、有廳、有堂、有廄、有拘留室、有廚房、有公署；偏遠地區甚至還得設置耕地，又要能駐軍⋯⋯。此外，秦、漢時期亭長之公權力，一直備受皇權支持和重視，這也是當時警察人員在執法上，可以更確切也更有效益的其一重要原因。

The police stations (ting) in the Qin and Han Dynasty were different in buildings' sizes. Big or small police stations depended on police's necessities. This article explained today's police stations' eight functions. The police stations usually had their own buildings, rooms, lobbies, stables, detention centers, kitchens, offices, dormitories and their own farms. Besides, the emperors of Qin and Han Dynasty emphasized the public authority of the police, and that was why the police could exercise the authority certainly.