The extended Fan family clan stands out as the most famous official merchant-household established by the Imperial Household Department during the earliest stages of the Qing Dynasty. One member of the family, Fan Yongdou, had been active in the Manchu-Mongolian regions since the late Ming Dynasty, and his descendants continued to engage in border trade during the early Qing Dynasty, delivering military supplies to the north frontier for the imperial court during the Yongzheng and Qianlong reigns. The military expenses, most especially the transport of military supplies drained down the coffers during the wars with the Dzungar Khanate in the Kangxi, Yongzheng, and Qianlong periods. In the Kangxi era, the official price for transporting rice was 40 to 120 taels per picul, while Fan Yupin transported it for under 30 taels per picul, resulting in substantial savings in silver that had a significant financial impact. Past studies of Fan Yupin’s activities in Japan and mainland China have explored his business of transporting rice, purchasing ginseng, overseeing the salt industry, and compradoring foreign copper. However, in recent years, with the extensive opening of Manchu and Chinese archives at the First Historical Archives of China, it is now possible to supplement and expand on previous research. This article will discuss the border trade of the Fan family during the transition from the Ming Dynasty to the Qing Dynasty, Fan Yupin’s life and his role as an official merchant, the routes and quantities of rice he transported, and the sources of this rice. Fan Yupin gained the trust of Emperor Yongzheng, which allowed his sons and nephews to continue carrying military supplies in the Qianlong era. Finally, we will explore the political and commercial relationships of Fan Yupin, including Fu Erdan and Yiduli ‘s demand that he gave them silver, as well as the accusation by the Minister of War Tongzhi that he was exploiting other merchants, which lead Tongzhi to propose a switch to official transport for the military rice along the northern route.