The study of Chinese character cultural sphere or Sinosphere, for a long time, has primarily focused on the influence of Chinese character on the development of written forms in the regions of East and South Asia. The impact of Chinese character on scripts developed in neighboring North Asia, namely the Mongolian steppes, has received less attention, due to the multilingualism and complex trajectory of written forms changes in that area. Based on historical documents, stele carvings and cultural relics discovered since the 20th century, this study focuses on the two types of Khitan characters —large script and small script — created in North Asia in the 10th century and popularly used in centuries to examine the relationship between Khitan script, also its successor, the Jurchen script, and Chinese characters in terms of form, sound, and meaning, analyzing their borrowings, similarities and differences with Chinese characters. The study finds that the creation of the two types of Khitan scripts adhered to the structure and elements of Chinese characters in different degree with different invention strategies, but also introduced modifications and innovations, creating new glyphs and rules to suit the needs of written down Khitan language and expressing meaning. The creation of Jurchen large and small scripts, the successor to the Khitan scripts, was a borrowing and adaptation of the Khitan scripts, directly or indirectly a reaction to the historical spread, impact of Chinese character in North Asia. This study demonstrates the promotion and contribution of Chinese character to the scripts development of ethnic groups in the multilingual and multicultural context of North Asia, providing new data and new perspectives on studies of Sinosphere as well as studies of written forms generated from diverse sources around the world.