Abstract
In the following article, Advanced research methods of history and historical philology are used, along with a letter written by the Kazakh’s sultan Khankhoja, who owned the East Kazakh steppe since the end of the 18thcentury and had close relations with the neighboring Qing dynasty, to the local taiji who was in charge of af-fairs in Tarbagatai is studied. The letter is written in the old Kazakh written language, the language is simple, understandable, the content is deep, it is an original document written by the Kazakh, which is very valuable for the comprehensive study of the trade business of the Kazakh steppe. In the previous studies, it was often said that “silk was traded for horses”, but as we can see from the content of the analyzed letter, not only hors-es were exchanged for silk, sometimes other livestock were also traded. The letter is now stored in the First Historical Archives of China in Beijing. From the contents of the letter, the long history of Kazakh- Kyrgyz relations can be indirectly understood.