我国县级行政建制，历史悠久。自秦实行郡县制以来，它始终既是我国的基层行政区，又是基本的经济区域，是一级相对独立、完整的行政—经济区域。县这个层次，处于宏观与微观、上层与基层的衔接点，是城市与乡村的结合部，它既是以中央为主体的宏观调控体系中的基础性层次，又 China’s county-level administrative system, has a long history. Since Qin practiced the system of counties and counties, it has always been both the grassroots administrative region and the basic economic region in our country and the relatively independent and complete administrative and economic region at the first level. This level of the county is at the macroscopic and microcosmic level. The connection point between the upper and grassroots levels is the combination of the city and the countryside. It is not only the basic level in the macro-control system with the central government as the main body,