Abstract: Ancient Tea-Horse Trail was essentially a network connecting different cultural circles. This network kept evolving and developing and carried different implications in different periods．Linguistic correlation is good evidence for the formation of a cultural circle．Cognates embody the autogenous relations in genetics while loan words reflect the relations in contact and transmission．Some linguistic evidence related closely to the evolution of Ancient Tea-Horse Trail can be found by comparing Chinese with the Tibeto-Burman languages distributed in the key birthplaces of Ancient Tea-Horse Trail．On that basis，some temporal dimensions in the evolution of the network of Ancient Tea-Horse Trail can be clarified by some age- dating methods in historical linguistics．
Key words: Sino-Tibetan comparison，Ancient Tea-Horse Trail，evolution，age dating
The Chinese version appeared in Thinking, 2016(6).
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