The article examines the activities of the Muslim astronomer and geographer Jamaliddin Muhammad ibn Bukhari, a native of Central Asia, the creator of the "Eternal Calendar" and a man who discovered the scientific achievements of the East for China, thereby making his contribution to the development of science and technology during the reign of the Mongol dynasty Yuan. Through his knowledge, Jamaliddin became a close advisor to Kublai Khan and promoted foreign and Chinese talents. He initiated various imperial projects: the construction of the Huihui Astronomy Department, the compilation of a collection of gazetteers and maps, etc. He held the following positions: Head of the Ephemeris Department of the Western Regions, Head of the Astronomy Department in Beijing, a member of the Jixian Academy, Dr. Zhongfeng, Kublai Khan's personal astrologer and secretary palace library.