The Tay people are the ethnic minorities with the largest population in Viet Nam, mainly distributed in the Northern Uplands and Midlands, mostly concentrated in the provinces of Cao Bang, Lang Son, Tuyen Quang and Ha Giang. Over the long history of development, along with the development and improvement of their language, the Tay people have gradually created a type of writing system using the graphic, phonetic, and meaning elements of Chinese characters in combination with indigenous phonetic and linguistic elements, to create the system that is called the Nom-Tay scripts or the Nom script of the Tay ethnic group. Traditional Tay literature is mainly recorded in this Nom - Tay script. The article reliesupon the texts that belong to the genre of narrative poetry (in this genre, a story is written as a long poem) written in Nom - Tay- the most significant part of the written classical folk literature of the Tay ethnic group. Materials from the texts, currently stored at the Institute of Sino - Nom Studies (Vietnam Academy of Social Sciences), will be used to conduct an analysis of the usage and the method of writing of the Chinese characters in these texts. Thereby, the article strives to confirm the important role and the ample appearance of the Chinese characters in VietnameseNom- Tay texts.