In the period of ancient linguistics-the period of ancient Xiangxiong civilization, Xiangxiong linguistics served the ancient Tibetan civilization. It is introduced in Legs BZ Hadrin Boche Gther Mstod and Mr. Nankanobu's History of Ancient Xiangxiong and Tubo Civilization. Brda sprod nyi shu bdun pa, which was handed down later, can be regarded as the inheritance and development of this language research tradition.

Tibetan is the language used by Tibetans in China, belonging to the Tibetan branch of Sino-Tibetan language family. Modern Tibetan has the following characteristics:

1, voiced consonants tend to be voiced, and the voiced consonants preserved in some areas are voiced basic consonants developed from ancient complex consonants.

2. Complex consonants tend to simplify and disappear, and only binary complex consonants with pre-consonants are kept in some areas.

3. Monovowels increase, especially nasal vowels.

4. Vowels are different in length and complementary to tones.

There are two kinds of real compound vowels: nasalized and non-nasalized.