1, Yi language is ideographic, also called syllabic language.

2. This script was formed in13rd century. It is estimated that there are more than 10 thousand words in the old Yi language, and there are more than 1000 words with high frequency of use.

3. Yi ancient books cover a wide range, including astronomy, geography, politics, economy, military, medicine, arithmetic, topography, landforms, biology, agriculture and animal husbandry, etc.