《汉书·传·傅常郑甘陈段传》
到宣帝时，郑吉以侍郎身份在渠黎屯田，积累了谷物，就征发各国军队攻破车师，升他为卫司马，派他领护鄯善以西的南道。
至宣帝时，吉以侍郎田渠黎，积谷，因发诸国兵攻破车师，迁卫司马，使护鄯善以西南道。
By the time of Emperor Xuan, Zheng Ji, as a Shi Lang, garrisoned troops at Quli, accumulated grain, and then mobilized troops from various countries to attack Cheshi, and promoted him to Wei Sima, and sent him to lead the protection of the Southern Route west of Shanshan.