汉景帝时徐卢等七王降汉封侯是汉匈关系史上的一件大事,其意义不止于丞相周亚夫因之被免、朝廷内中枢权力的更迭,更在于标志着汉王朝对降附之外族政策的变化,即“初开封赏之科”,对后世影响巨大。但诸典籍对此事不仅记载阙略,而且相互间抵牾之处颇多,《史记》《汉书》对降附者人数、姓名、身份、受封地望等的记载均有错舛,二书应相互参证,但相较而言《史记》讹误较少。徐卢等人虽然诸典籍均言为“王”,但其实不过为匈奴部族之酋长,地位并不显赫,汉景帝对其封侯主要是出于政治上之考虑。而将其安置于涿郡、颍川等中原内地,反映了汉王朝对降附者的防范猜忌,这与汉武帝时代将降人置于边地、建立属国的方式有很大的不同,显示出不同时代汉匈之间力量的消长变化。
In the reign of the Han Emperor Jingdi, the surrender of the seven Hun kings including Xu Lu is a big event in the history of the Han and the Hun, which marks the changes of the Han Dynasty towards the other nationalities, and has great influences on the later generations. However, records of it are unclear and contradictory in some ancient books. As for the number of surrender, name, identity and so on, some mistakes are made even in the famous history books of Shih Chi and History of the Han Dy-nasty. In fact, the seven Hun kings were not kings but tribal chiefs. Han Emperor Jingdi put them in the Central Plains, such as Zhuojun and Yingchuan, which reflected his prevention and suspension of them as well as the changes of power between the Han and the Hun, different from that of Han Emperor Wudi.