本文以西汉王朝为例,对古代中国王朝的疆域形成进行了探讨。认为,不同藩属体系的碰撞和重组是王朝疆域形成的主要途径。在西汉初期,中华大地上存在以西汉王朝和匈奴为核心的两大藩属体系,以及众多的亚藩属体系和弱藩属体系。自武帝时期开始,随着西汉王朝国力的增强,两大藩属体系进入碰撞、重组阶段,其结果是不仅以匈奴为核心的藩属体系被纳入西汉王朝的藩属体系中,其他弱藩属体系也进入其中,属于西汉王朝藩属体系的亚藩属体系则成为了郡县,由此最终形成了郡县、特设机构、藩属国三个不同层次构成的西汉王朝疆域。 Taking the Western Han Dynasty as an example, this article discusses the formation of the territory of the ancient Chinese dynasties. It is considered that the collision and reorganization of different vassal systems are the main ways to form the dynasty’s territory. In the early Western Han Dynasty, there were two vassal systems centered on the Western Han Dynasty and the Huns, and many sub-vassal and weak vassal systems on the Chinese land. Since the reign of Emperor Wudi, with the strengthening of the national power of the Western Han Dynasty, the two major vassal systems entered the phase of collision and reorganization. As a result, not only the vassal system with the Huns as the core was included in the vassal system of the Western Han Dynasty, but also other weak vassal systems , The sub-feudal system belonging to the Western Han Dynasty vassal system became the county, which eventually formed the Western Han Dynasty dynasty composed of three different levels of county, ad hoc body and vassal state.